1. Department of Psychiatry, Universiti Kebangsaan Malaysia Medical Centre, Wilayah Persekutuan Kuala Lumpur, Malaysia
2. Department of Psychiatry, Hospital Tengku Ampuan Afzan, Kuantan, Pahang, Malaysia
3. Department of Psychiatry and Mental Health, Hospital Taiping, Perak, Malaysia
4. Institute for Clinical Research, Ministry of Health, Shah Alam, Selangor, Malaysia