Funding for this research was provided by:
National Natural Science Foundation of China (81574098, 81503678)
Received: 19 September 2018
Accepted: 22 April 2019
First Online: 17 May 2019
Ethics approval and consent to participate
: This study was conducted in accordance with the tenets of the Declaration of Helsinki. The research did not involve any direct participation by human subjects. The mumps data were extracted from monthly reports maintained by the Chinese Center for Disease Control. All individual-level data were anonymous. The study was approved by Ethics Committee on Medicine and Laboratory Animals, Beijing University of Chinese Medicine, China (approval number 2017BZHYLL0507).
: Not applicable.
: The authors declare that they have no competing interests.
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