[1] Guangdong Med Univ, Affiliated Hosp, Dept Dermatol, Zhanjiang, Peoples R China
[2] Guangdong Med Univ, Affiliated Hosp, Dept Gastroenterol, Zhanjiang, Peoples R China
[3] Sun Yat Sen Univ, Affiliated Hosp 6, Dept Dermatol, Guangzhou, Peoples R China
[4] Brandenburg Med Sch Theodor Fontane, Dessau Med Ctr, Fac Hlth Sci Brandenburg, Dept Dermatol, Dessau, Germany
[5] Brandenburg Med Sch Theodor Fontane, Dessau Med Ctr, Fac Hlth Sci Brandenburg, Dept Venereol, Dessau, Germany
[6] Brandenburg Med Sch Theodor Fontane, Dessau Med Ctr, Fac Hlth Sci Brandenburg, Dept Allergol & Immunol, Dessau, Germany