1. Department of Dermatology; Regional Dermatology Training Centre; P.O. Box 8332 Moshi Tanzania
2. Department of Medicine; Moi University School of Medicine; Box 4606-30100 Eldoret Kenya
3. Mbeya Referral Hospital; P.O Box 419 Mbeya Tanzania
4. Eberhard Karls Universität; Universitäts-Hautklinik; Liebermeisterstraße 25 72076 Tübingen Germany