1. Departments of Dermatology,
2. Institute of Medical Science, St. Marianna University School of Medicine, 2‐16‐1 Sugao, Miyamae, Kawasaki 216, Japan,
3. SRL, Inc. 5‐6‐50, Shinmachi, Hino, Tokyo 191, Japan
4. Pathology, Kumamoto University School of Medicine, 1‐1‐1 Honjo, Kumamoto 860, Japan,