1. Clinical Research Centre, Hospital Tuanku Fauziah, Perlis, Ministry of Health Malaysia
2. Department of Paediatrics, Sligo University Hospital, Sligo, Ireland
3. Clinical Research Centre, Hospital Sultanah Bahiyah, Alor Setar, Kedah, Ministry of Health Malaysia
4. National Anti-Drug Agency (Padang Besar Branch), Padang Besar ICQS Complex, Perlis, Malaysia
5. Director Office, Hospital Tuanku Fauziah, Perlis, Ministry of Health Malaysia