{"id":835,"date":"2026-04-12T18:18:26","date_gmt":"2026-04-12T18:18:26","guid":{"rendered":"https:\/\/claypipestaging.com\/?page_id=835"},"modified":"2026-04-19T15:40:35","modified_gmt":"2026-04-19T15:40:35","slug":"pkn-jaarboek","status":"publish","type":"page","link":"https:\/\/claypipestaging.com\/en_gb\/pkn-jaarboek\/","title":{"rendered":"PKN Jaarboek"},"content":{"rendered":"<p class=\"\">Sinds 2013 publiceert de PKN ieder jaar een jaarboek op A4 formaat met verschillende artikelen, onderzoeksresultaten en andere onderwerpen met betrekking tot de tabakspijpen historie. Dit jaarboek wordt ieder jaar aan onze leden toegestuurd. <\/p>\n\n\n\n<p class=\"\">Hieronder de laatst verschenen exemplaren. <\/p>\n\n\n\n<p class=\"\">De jaarboeken die in de laatste 3 jaren zijn verschenen zijn alleen in te zien voor leden. De eerdere jaarboeken die vanaf 2013 zijn verschenen kunt u via de verschillende links hieronder inzien.<\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-28f84493 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image aligncenter size-large\"><a href=\"https:\/\/claypipestaging.com\/en_gb\/zoek-website\/jaarboek-2025\/\"><img data-recalc-dims=\"1\" decoding=\"async\" width=\"683\" height=\"1024\" loading=\"lazy\" src=\"https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2025.png?resize=683%2C1024&#038;ssl=1\" alt=\"\" class=\"wp-image-837\" srcset=\"https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2025.png?resize=683%2C1024&amp;ssl=1 683w, https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2025.png?resize=200%2C300&amp;ssl=1 200w, https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2025.png?resize=768%2C1152&amp;ssl=1 768w, https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2025.png?resize=8%2C12&amp;ssl=1 8w, https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2025.png?w=780&amp;ssl=1 780w\" sizes=\"auto, (max-width: 683px) 100vw, 683px\" \/><\/a><figcaption class=\"wp-element-caption\">2025<\/figcaption><\/figure>\n\n\n\n<p class=\"has-text-align-center\">(Leden)<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\"><\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\"><\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<p class=\"has-text-align-center\"><\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\"><\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<p class=\"has-text-align-center\"><\/p>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-28f84493 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image aligncenter size-large\"><img decoding=\"async\" width=\"780\" height=\"1170\" loading=\"lazy\" src=\"https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2024.png?fit=683%2C1024&amp;ssl=1\" alt=\"\" class=\"wp-image-838\" srcset=\"https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2024.png?w=780&amp;ssl=1 780w, https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2024.png?resize=200%2C300&amp;ssl=1 200w, https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2024.png?resize=683%2C1024&amp;ssl=1 683w, https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2024.png?resize=768%2C1152&amp;ssl=1 768w, https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2024.png?resize=8%2C12&amp;ssl=1 8w\" sizes=\"auto, (max-width: 780px) 100vw, 780px\" \/><figcaption class=\"wp-element-caption\">2024<\/figcaption><\/figure>\n\n\n\n<p class=\"has-text-align-center\">(Leden)<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image aligncenter size-large\"><img data-recalc-dims=\"1\" decoding=\"async\" width=\"683\" height=\"1024\" loading=\"lazy\" src=\"https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2023.png?resize=683%2C1024&#038;ssl=1\" alt=\"\" class=\"wp-image-853\" srcset=\"https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2023.png?resize=683%2C1024&amp;ssl=1 683w, https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2023.png?resize=200%2C300&amp;ssl=1 200w, https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2023.png?resize=768%2C1152&amp;ssl=1 768w, https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2023.png?resize=8%2C12&amp;ssl=1 8w, https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2023.png?w=780&amp;ssl=1 780w\" sizes=\"auto, (max-width: 683px) 100vw, 683px\" \/><figcaption class=\"wp-element-caption\">2023<\/figcaption><\/figure>\n\n\n\n<p class=\"has-text-align-center\">(Leden)<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image aligncenter size-large\"><img data-recalc-dims=\"1\" decoding=\"async\" width=\"683\" height=\"1024\" loading=\"lazy\" src=\"https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2022.webp?resize=683%2C1024&#038;ssl=1\" alt=\"\" class=\"wp-image-851\" srcset=\"https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2022.webp?resize=683%2C1024&amp;ssl=1 683w, https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2022.webp?resize=200%2C300&amp;ssl=1 200w, https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2022.webp?resize=768%2C1152&amp;ssl=1 768w, https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2022.webp?resize=8%2C12&amp;ssl=1 8w, https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2022.webp?w=780&amp;ssl=1 780w\" sizes=\"auto, (max-width: 683px) 100vw, 683px\" \/><figcaption class=\"wp-element-caption\">2022<\/figcaption><\/figure>\n\n\n\n<p class=\"has-text-align-center\"><\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image aligncenter size-large\"><a href=\"https:\/\/claypipestaging.com\/en_gb\/zoek-website\/het-jaarboek-2021\/\"><img data-recalc-dims=\"1\" decoding=\"async\" width=\"683\" height=\"1024\" loading=\"lazy\" src=\"https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2021.png?resize=683%2C1024&#038;ssl=1\" alt=\"\" class=\"wp-image-850\" srcset=\"https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2021.png?resize=683%2C1024&amp;ssl=1 683w, https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2021.png?resize=200%2C300&amp;ssl=1 200w, https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2021.png?resize=768%2C1152&amp;ssl=1 768w, https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2021.png?resize=8%2C12&amp;ssl=1 8w, https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2021.png?w=780&amp;ssl=1 780w\" sizes=\"auto, (max-width: 683px) 100vw, 683px\" \/><\/a><figcaption class=\"wp-element-caption\">2021<\/figcaption><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image aligncenter size-large\"><a href=\"https:\/\/claypipestaging.com\/en_gb\/zoek-website\/het-jaarboek-2020-artikelen-over-tabakspijpen\/\"><img data-recalc-dims=\"1\" decoding=\"async\" width=\"683\" height=\"1024\" loading=\"lazy\" src=\"https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2020.png?resize=683%2C1024&#038;ssl=1\" alt=\"\" class=\"wp-image-849\" srcset=\"https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2020.png?resize=683%2C1024&amp;ssl=1 683w, https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2020.png?resize=200%2C300&amp;ssl=1 200w, https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2020.png?resize=768%2C1152&amp;ssl=1 768w, https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2020.png?resize=8%2C12&amp;ssl=1 8w, https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2020.png?w=780&amp;ssl=1 780w\" sizes=\"auto, (max-width: 683px) 100vw, 683px\" \/><\/a><figcaption class=\"wp-element-caption\">2020<\/figcaption><\/figure>\n\n\n\n<p class=\"has-text-align-center\"><\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image aligncenter size-large\"><a href=\"https:\/\/claypipestaging.com\/en_gb\/zoek-website\/het-jaarboek-2019\/\"><img data-recalc-dims=\"1\" decoding=\"async\" width=\"683\" height=\"1024\" loading=\"lazy\" src=\"https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2019.png?resize=683%2C1024&#038;ssl=1\" alt=\"\" class=\"wp-image-848\" srcset=\"https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2019.png?resize=683%2C1024&amp;ssl=1 683w, https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2019.png?resize=200%2C300&amp;ssl=1 200w, https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2019.png?resize=768%2C1152&amp;ssl=1 768w, https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2019.png?resize=8%2C12&amp;ssl=1 8w, https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2019.png?w=780&amp;ssl=1 780w\" sizes=\"auto, (max-width: 683px) 100vw, 683px\" \/><\/a><figcaption class=\"wp-element-caption\">2019<\/figcaption><\/figure>\n\n\n\n<p class=\"has-text-align-center\"><\/p>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-28f84493 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image aligncenter size-large\"><img data-recalc-dims=\"1\" decoding=\"async\" width=\"683\" height=\"1024\" loading=\"lazy\" src=\"https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2018.webp?resize=683%2C1024&#038;ssl=1\" alt=\"\" class=\"wp-image-846\" srcset=\"https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2018.webp?resize=683%2C1024&amp;ssl=1 683w, https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2018.webp?resize=200%2C300&amp;ssl=1 200w, https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2018.webp?resize=768%2C1152&amp;ssl=1 768w, https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2018.webp?resize=8%2C12&amp;ssl=1 8w, https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2018.webp?w=780&amp;ssl=1 780w\" sizes=\"auto, (max-width: 683px) 100vw, 683px\" \/><figcaption class=\"wp-element-caption\">2018<\/figcaption><\/figure>\n\n\n\n<p class=\"has-text-align-center\"><\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image aligncenter size-full\"><img data-recalc-dims=\"1\" decoding=\"async\" width=\"780\" height=\"1170\" loading=\"lazy\" src=\"https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2017.webp?resize=780%2C1170&#038;ssl=1\" alt=\"\" class=\"wp-image-844\" srcset=\"https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2017.webp?w=780&amp;ssl=1 780w, https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2017.webp?resize=200%2C300&amp;ssl=1 200w, https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2017.webp?resize=683%2C1024&amp;ssl=1 683w, https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2017.webp?resize=768%2C1152&amp;ssl=1 768w, https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2017.webp?resize=8%2C12&amp;ssl=1 8w\" sizes=\"auto, (max-width: 780px) 100vw, 780px\" \/><figcaption class=\"wp-element-caption\">2017<\/figcaption><\/figure>\n\n\n\n<p class=\"has-text-align-center\"><\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image aligncenter size-full\"><img data-recalc-dims=\"1\" decoding=\"async\" width=\"780\" height=\"1170\" loading=\"lazy\" src=\"https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2016.png?resize=780%2C1170&#038;ssl=1\" alt=\"\" class=\"wp-image-843\" srcset=\"https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2016.png?w=780&amp;ssl=1 780w, https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2016.png?resize=200%2C300&amp;ssl=1 200w, https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2016.png?resize=683%2C1024&amp;ssl=1 683w, https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2016.png?resize=768%2C1152&amp;ssl=1 768w, https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2016.png?resize=8%2C12&amp;ssl=1 8w\" sizes=\"auto, (max-width: 780px) 100vw, 780px\" \/><figcaption class=\"wp-element-caption\">2016<\/figcaption><\/figure>\n\n\n\n<p class=\"has-text-align-center\"><\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image aligncenter size-large\"><img data-recalc-dims=\"1\" decoding=\"async\" width=\"683\" height=\"1024\" loading=\"lazy\" src=\"https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2015.webp?resize=683%2C1024&#038;ssl=1\" alt=\"\" class=\"wp-image-841\" srcset=\"https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2015.webp?resize=683%2C1024&amp;ssl=1 683w, https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2015.webp?resize=200%2C300&amp;ssl=1 200w, https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2015.webp?resize=768%2C1152&amp;ssl=1 768w, https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2015.webp?resize=8%2C12&amp;ssl=1 8w, https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2015.webp?w=780&amp;ssl=1 780w\" sizes=\"auto, (max-width: 683px) 100vw, 683px\" \/><figcaption class=\"wp-element-caption\">2015<\/figcaption><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image aligncenter size-large\"><img data-recalc-dims=\"1\" decoding=\"async\" width=\"683\" height=\"1024\" loading=\"lazy\" src=\"https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2014.png?resize=683%2C1024&#038;ssl=1\" alt=\"\" class=\"wp-image-840\" srcset=\"https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2014.png?resize=683%2C1024&amp;ssl=1 683w, https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2014.png?resize=200%2C300&amp;ssl=1 200w, https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2014.png?resize=768%2C1152&amp;ssl=1 768w, https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2014.png?resize=8%2C12&amp;ssl=1 8w, https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2014.png?w=780&amp;ssl=1 780w\" sizes=\"auto, (max-width: 683px) 100vw, 683px\" \/><figcaption class=\"wp-element-caption\">2014<\/figcaption><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image aligncenter size-large\"><img data-recalc-dims=\"1\" decoding=\"async\" width=\"683\" height=\"1024\" loading=\"lazy\" src=\"https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2013.png?resize=683%2C1024&#038;ssl=1\" alt=\"\" class=\"wp-image-839\" srcset=\"https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2013.png?resize=683%2C1024&amp;ssl=1 683w, https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2013.png?resize=200%2C300&amp;ssl=1 200w, https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2013.png?resize=768%2C1152&amp;ssl=1 768w, https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2013.png?resize=8%2C12&amp;ssl=1 8w, https:\/\/i0.wp.com\/claypipestaging.com\/wp-content\/uploads\/2026\/04\/Jaarboek-2013.png?w=780&amp;ssl=1 780w\" sizes=\"auto, (max-width: 683px) 100vw, 683px\" \/><figcaption class=\"wp-element-caption\">2013<\/figcaption><\/figure>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Sinds 2013 publiceert de PKN ieder jaar een jaarboek op A4 formaat met verschillende artikelen, onderzoeksresultaten en andere onderwerpen met 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