Author(s) Kar Yiu Luk, K Y Claudia Lai, Ching Ching Li, Wai Hang Cheung, Siu Ming Rin Lam, Ho Yin Li, Ka Po Ng, Wing Hing Shiu, Chui Yee So, Siu Fung Wan Year 2011 Link https://pubmed.ncbi.nlm.nih.gov/21412848/
