Funding for this research was provided by:
Zhejiang Province Public Welfare Technology Application Research Project (2017C33201)
National Natural Science Foundation of China (81301514)
Medical Health Science and Technology Project of Zhejiang Provincial Health Commission (2017PY024, 2018PY022)
Article History
Received: 3 October 2018
Accepted: 11 February 2019
First Online: 8 March 2019
Compliance with ethical standards
: The author(s) declare that they have no competing interests.