Text and Data Mining valid from 2019-07-15
Received: 2 January 2018
Revised: 5 March 2019
Accepted: 20 March 2019
First Online: 15 July 2019
Compliance with Ethical Standards
: The authors have no conflicts of interest to declare.
: All procedures involving human participants were in accordance with the ethical standards of Wuhan University and UNZA Medical Research Committee and with the 1964 Helsinki declaration and its later amendments.
: Informed consent was obtained from all individual participants included in the study.