1. Departments of Dermatology, Northwestern University Medical School, Chicago, IL, U.S.A.,
2. Division of Oral Medicine, Northwestern University Dental School, Chicago, IL, U.S.A.,
3. Keio University School of Medicine, Tokyo, Japan,
4. Medicine Service, Section of Dermatology, Lakeside Division, VA Chicago Health Care System, Chicago, IL, U.S.A.