Karniza Khalid1, Kean Hong Eng2, Nurul Amani Abd Ghani2, Mohan Arunasalam Nallusamy3
1Clinical Research Centre and 2Department of Paediatrics, Hospital Tuanku Fauziah, Kangar, Perlis, Ministry of Health Malaysia; 3Department of Surgery, Hospital Sultanah Bahiyah, Alor Setar, Kedah, Ministry of Health Malaysia.