Funding for this research was provided by:
Ministry of Health of the People's Republic of China
Conselho Nacional Para Desenvolvimento Científico e Tecnológico (CNPq-Brazil).
Text and Data Mining valid from 2019-10-15
Received: 29 March 2018
Accepted: 3 September 2019
First Online: 15 October 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.