Article Information
Author Information
- Mechteld R.M. Visser,
- Ellen M.A. Smets,
- Frans J. Oort,
- Hanneke C.J.M. de Haes
- Correspondence to:
Dr. Mechteld R.M. Visser, Academic Medical Centre, PO Box 22700, 1100 DE, Amsterdam, The Netherlands; fax 31 20 566 9104; m.r.visser{at}amc.uva.nl