Vermeulen, Karin M.
Jansen, Daniƫlle E. M. C.
Buskens, Erik
Knorth, Erik J.
Reijneveld, Sijmen A.
Funding for this research was provided by:
This research was supported by a grant from the Netherlands Organization for Health Research and Development (ZonMw) . ((Grant numbers 80-82410-98-002 and 80-82410-98-012))