[1] Natl Univ Singapore, Yong Loo Lin Sch Med, Singapore, Singapore
[2] Dhanalakshmi Srinivasan Med Coll Hosp, Dept Pathol, Perambalur, Tamil Nadu, India
[3] Govt Kilpauk Med Coll, Dept Med, Chennai, Tamil Nadu, India
[4] Flinders Univ S Australia, Coll Med & Publ Hlth, Adelaide, SA, Australia
[5] Natl Univ Singapore, Yong Loo Lin Sch Med, Dept Anat, Singapore, Singapore
[6] Natl Univ Singapore, Yong Loo Lin Sch Med, Dept Anat, Singapore 117594, Singapore