1Department of Pediatrics, Faculty of Medicine, Ramathibodi Hospital, Mahidol University, Bangkok, Thailand; Centre for Hormone Research, The Royal Childrens Hospital, Melbourne, Australia 2Centre for Hormone Research, The Royal Children's Hospital, Melbourne, Australia 3Department of Complex Biochemistry, The Royal Children's Hospital, Melbourne, Australia 4Department of Endocrinology, Genetics and Metabolism, National Hospital of Pediatrics, Hanoi, Vietnam 5Department of VCGS Pathology, Murdoch Childrens Research Institute, The Royal Children's Hospital, Melbourne, Australia 6Department of Paediatrics, University of Melbourne, Australia