Authors: Kirsten Kortram; Bert van Ramshorst; Thomas L Bollen; Marc G H Besselink; Dirk J Gouma; Tom Karsten; Philip M Kruyt; Grard A P Nieuwenhuijzen; Johannes C Kelder; Ellen Tromp; Djamila Boerma Journal: Trials Date: 2012-01-12 Impact factor: 2.279