Text and Data Mining valid from 2019-01-22
Received: 16 September 2018
Accepted: 7 January 2019
First Online: 22 January 2019
Compliance with ethical standards
: No potential conflicts of interest to disclose for the authors Lung-Yi Mak, Danny Ka-Ho Wong, Wai-Kay Seto, Qin Ning, Ka-Shing Cheung, James Fung, Ching-Lung Lai, and Man-Fung Yuen.
: This study was approved by the Institutional Review Board/Ethics Committee of the University of Hong Kong and the Hong Kong West Cluster of Hospital Authority.