The authors are with the Coagulation Laboratory, Department of Pathology and Laboratory Medicine, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania, USA. Tel: (+1) 215 590 6117; fax: (+1) 215 590 4834; e-mail: email@example.com
(Received 17 November 1999;
revised 29 March 2000; accepted 1 May 2000)
Address correspondence to Eleanor S. Pollak, MD, Assistant Professor, University of Pennsylvania School of Medicine, 316C Abramson Research Building, 34th and Civic Center Boulevard, Philadelphia, PA 19104-4399, USA.