Liang, Jingbo
Yuan, Hsiang-Yu
Wu, Lindsey
Pfeiffer, Dirk Udo
Article History
Received: 5 January 2021
Accepted: 20 April 2021
First Online: 5 May 2021
Declarations
:
: Not applicable. No formal ethical review and informed consent were required, as the data used in this analysis were collected from online open datasets and all data were de-identified and aggregated to the city-level as described in the manuscript.
: Not applicable.
: All authors declare no competing interests.