1. JC School of Public Health and Primary Care; The Chinese University of Hong Kong and Prince of Wales Hospital; Shatin Hong Kong
2. Department of Dermatology; Godavari Foundation Medical College and Research Center; DUPMCJ; Nashik India
3. Department of Dermatology; Mayo Clinic College of Medicine; Rochester MN USA
4. Histologische Diagnostik; Department of Dermatology; University Hospital Zürich; Zurich Switzerland