Huai, Pengcheng http://orcid.org/0000-0002-9658-018X
Li, Furong
Li, Zhen
Sun, Lele
Fu, Xi’an
Pan, Qing
Yu, Gongqi
Chai, Zemin
Chu, Tongsheng
Mi, Zihao
Bao, Fangfang
Wang, Honglei
Zhou, Bingni
Wang, Chuan
Sun, Yonghu
Niu, Guiye
Zhang, Yuan
Fu, Fanghui
Lang, Xiaoqiao
Wang, Xiaoling
Zhao, Hui
Liu, Daina
Liu, Hong
Liu, Dianchang
Liu, Jian
Xu, Aiqiang
Zhang, Furen
Funding for this research was provided by:
The National Key Research and Development Program of China (2016YFE0201500)
The Innovation Project of Shandong Academy of Medical Sciences (No)
The Syphilis and Other Sexually Transmitted Diseases Control Research in Shandong (No)
Article History
Received: 23 December 2018
Accepted: 15 April 2019
First Online: 6 May 2019
Ethics approval and consent to participate
: This study was conducted in conformity to the ethical principles stated in the Helsinki Declaration. This study was reviewed and approved by the Ethics Committee of Shandong Provincial Institute of Dermatology and Venereology (approval number: 2016–04). The topic of the questionnaires was related to sex. Participants may refuse to answer sensitive questions or provide untruthful information if they signed informed consent. In order to obtain accurate information, oral informed consent instead of written consent was obtained from participants before each interview. This procedure was approved by the ethics committee.
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.