Journal article (2009) - F.J. Beekman (author), B. Vastenhouw (author), G van der Wilt (author), M Vervloet (author), R Visscher (author), A Booij (author), M Gerrits (author), C Ji (author), R.M. Ramakers (author), F. van der Have (author)

Journal article (2008) - R Visscher (author), S. Zijlstra (author)