From the Department of Pediatrics (I.Y., N.S., J.M., E.N., M.I., Y.K.) and Laboratory Medicine (K.S.), School of Medicine, University of Tokushima, Tokushima, Japan.Address correspondence and reprint requests to Ichiro Yokota, MD, Department of Pediatrics, University of Tokushima, 3-Kuramoto cho, Tokushima City, Tokushima 770, Japan. E-mail: yichiro@clin. med.tokushima-u.ac.jp.Received for publication 7 March 1995 and accepted in revised form 24 August 1995.