First Department of Internal Medicine, Nagoya City University Medical School, Nagoya City, Japan
Reprint requests and correspondence: Tomoyuki Nomura, MD, First Department of Internal Medicine, Nagoya City University Medical School, 1-Kawasumi, Mizuho-cho, Mizuho-ku, Nagoya City, Japan 467-8601.
Received 28 July 2000; accepted 08 August 2000