1. School of Optometry, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR
2. Squina Centre for Infection Control, School of Nursing, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR
3. School of Optometry, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR 2Squina Centre for Infection Control, School of Nursing, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR