[1] Univ Hong Kong, Dept Surg, Queen Mary Hosp, 2-F,Professorial Block,102 Pokfulam Rd, Hong Kong, Hong Kong, Peoples R China
[2] Apollo Inst Pediat Sci, Pediat Urol & Pediat Surg, Delhi Mathura Rd, New Delhi 110076, India
[3] Chinese Univ Hong Kong, Sch Biomed Sci, Shatin, Hong Kong, Peoples R China