Fan Soo Kheng, Sathasivam A/L Manikam, Tan Hwei Yuin, Siti Hajar, Shukor bin Osman, Robinson A/L Ajistan Hospital Bukit Mertajam, Pulau Pinang Full Abstract : Download here
Institute for Health Systems Research (IHSR) National Institutes of Health (NIH) Jalan Setia Murni U13/52, Seksyen U13 Setia Alam, 40170 Shah Alam, Selangor.