Text and Data Mining valid from 2019-01-25
Received: 3 January 2019
Revised: 13 January 2019
Accepted: 14 January 2019
First Online: 25 January 2019
Compliance with Ethical Standards
: Hian Liang Huang, Aaron Kian Ti Tong, Sue Ping Thang, Sean Xuexian Yan, Winnie Wing Chuen Lam, Kelvin Siu Hoong Loke, Charlene Yu Lin Tang, Lenith Tai Jit Cheng, Gideon Su Kai Ooi, Han Chung Low, Butch Maulion Magsombol, Wei Ying Tham, Charles Xian Yang Goh, Colin Jingxian Tan, Yiu Ming Khor, Sumbul Zaheer, Pushan Bharadwaj, Wanying Xie and David Chee Eng Ng declare no conflict of interest.
: Ethical approval is not required for this work.