Authors' reply. (7th December 2010) - Evers, Annemieke C C; Brouwers, Hens A A; Hukkelhoven, Chantal W P M; Nikkels, Peter G J; Boon, Janine; Egmond-Linden, Anneke van; Hillegersberg, Jacqueline; Snuif, Yvette S; Sterken-Hooisma, Sietske; Bruinse, Hein W; Kwee, Anneke