Funding for this research was provided by:
Natural Science Foundation of Shanghai (81372005)
Natural Science Foundation of Ningbo Municipality (81401851 and 31371011)
Shanghai Municipal Commission of Health and Family Planning (20134244)
Shanghai Committee of Science and Technology (13DZ194808 and 15441904403)
Article History
Received: 20 September 2018
Accepted: 21 March 2019
First Online: 4 April 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.