1. Department of Pediatrics and Clinical Research Center; Sibu Hospital; Sibu Sarawak Malaysia
2. Lau King Howe Memorial Children Clinic; Divisional Health Office; Sibu Sarawak Malaysia
3. Faculty of Medicine; SEGi University Sibu Clinical Campus; Sibu Sarawak Malaysia
4. Clinical Epidemiology Unit; Clinical Research Center; Hospital Kuala Lumpur; Kuala Lumpur Malaysia