Optical Imaging Group for Translational Medicine, Tel: +852 3400 8654, Fax: +852 2362 4365, Web: www.polyu.edu.hk/hti,www.oigtm.com, PI Office: Y905, Lab: Y1101, Y1104, Lee Shau Kee Building, Department of Health Technology and Informatics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong