1. Andy S. K. Cheng, PhD, HKROT, is Assistant Professor, Ergonomics and Human Performance Laboratory, Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong; andy.cheng@polyu.edu.hk
2. Stella W. C. Cheng, MPH, HKROT, is Department Manager, Department of Occupational Therapy, Princess Margaret Hospital, New Territories, Hong Kong