Jeanette H. W. Leusen^1,2, Arthur J. Verhoeven¹ and Dirk Roos^1,3

¹ Central Laboratory of the Netherlands Red Cross Blood Transfusion Service and Laboratory for Experimental and Clinical Immunology, University of Amsterdam, Plesmanlaan 125, 1066 CX Amsterdam, The Netherlands.

²Department of Pediatrics, Emma's Children Hospital, Academic Medical Center, Amsterdam, The Netherlands.

Received 04/15/96; Accepted 05/05/96; On-line 07/01/96

This study was supported by grants from the Netherlands Organization for the Advancement of Scientific Research (NWO) and from the Netherlands Fund for Preventive Medicine (Praeventiefonds).