title: Kissing chancre of primary syphilis.
authors.affiliation: Department of Dermatology, Peking Union Medical College Hospital, Beijing, China.
authors.forename: Xiao Ke
authors.initials: XK
authors.lastname: Liu
authors.affiliation: Department of Dermatology, Peking Union Medical College Hospital, Beijing, China.
authors.forename: Zhong Shuai
authors.initials: ZS
authors.lastname: Wang
authors.affiliation: Department of Dermatology, Peking Union Medical College Hospital, Beijing, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Li