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Chapter 224Study demography and professional backgroundArticles included from countries in East Asia (China, Japan, and Korea) formed the largest group with 54 articles in total (57%), followed by the USA with 17 articles (18%) (Fig. 2). All included articles were in English except for four Chinese articles [20-23] and one article in Turkish [24]. These five articles were translated to English before data extraction. 361717333221 1 1 1 1 1 1 1 1 1 1GrafiektitelChina (36)USA (17)Japan (17)India (3)France (3)Turkey (3)Italy (2)Mexico (2)Germany (1)Pakistan (1)Switserland (1)Canada (1)Korea (1)Iran (1)Sweden (1)The Netherlands (1)Brazil (1)Russia (1)Austria (1)Figure 2. Country of origin of the research projectAfter hitting a peak number of articles around the year 2012 (nine articles), the number of published articles stabilized to around six per year, since then (Fig. 3). In 15 calendar years between 1985 and 2008, no articles were included in this study.012345678910198519861987198819891990199119921993199419951996199719981999200020012002200320042005200620072008200920102011201220132014201520162017201820192020Number of ArtclesYears of publicationFigure 3. Number of included articles per year of publicationTom van Riet.indd 24 26-10-2023 11:59