... semi-rural region of the Netherlands. MethodsStudy area and study populationThe s tudy was performed among residents of the semi-rural area of Westfriesland in the North-West of t he Netherlands (Figure ... this study was granted by the Netherlands Organization for Health Research and Development (ZonMW). Ulrike Gehringwas supported by a research fellowship of the Netherlands Organisation forScientific ... Environment, Bilthoven, the Netherlands, and MarcelAdriaanse of the Department of Health Sciences and EMGO Institute forHealth and Care Research, VU University Amsterdam, the Netherlands, fortheir...