1. Department of Dermatology; University of California Davis; 3301 C Street Sacramento CA U.S.A.
2. Veterans Administration, Northern California Health Care System; Dermatology Service; 10535 Hospital Way, Building 801 Mather CA 95655 U.S.A.
3. Department of Surgery; Podiatry Section; 10535 Hospital Way, Building 801 Mather CA 95655 U.S.A.
4. Plastic Surgery Section; University of Michigan; Ann Arbor MI U.S.A.