Funding for this research was provided by:
Chang Gung Memorial Hospital (CMRPG3G1191)
Text and Data Mining valid from 2020-01-23
Received: 22 July 2019
Accepted: 6 January 2020
First Online: 23 January 2020
Ethics approval and consent to participate
: This study was approved of by the Institutional Review Board of the Chang Gung Memorial Hospital (201800358B0) and the data holders of the NHI database and the National Birth Registry in Taiwan.
: Not applicable.
: The authors declare that they have no competing interests.