Sun, Yuexia http://orcid.org/0000-0001-6303-5436
Hou, Jing
Sheng, Ying
Kong, Xiangrui
Weschler, Louise B.
Sundell, Jan
Funding for this research was provided by:
National Key Research and Development Program of China (2017YFC0702700)
National Natural Science Foundation of China (21207097)
Natural Science Foundation of Tianjin City (16JCYBJC22700)
Article History
Received: 12 July 2018
Accepted: 3 December 2018
First Online: 9 January 2019
Compliance with ethical standards
:
: Ethical approval was obtained from the Research Office at Tianjin University. Our participants provided verbal informed consent to participate in this study. This study is an anonymous questionnaire survey. It involves no risk to the subjects. The study could not be carried out practically with written consent. Completed surveys reflected participant consent. The completed surveys were stored in a lock cabinet. The Tianjin University Research Office approved this consent procedure.
: The authors declare that they have no competing interests.