Journal article (2014) - Erik van den Akker (author), WM Passtoors (author), BT Heijmans (author), A.B. Maier (author), DI Boomsma (author), JN Kok (author), PE Slagboom (author), M.J.T. Reinders (author), M. Beekman (author), R Jansen Jansen (author), E.W. van Zwet (author), JJ Goeman Goeman (author), M. Hulsman (author), V Emilsson (author), Marcus Perola (author), G Wilemsen (author), BWJH Penninx (author)