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United Nations University-International Institute for Global Health, UNU-IIGH Building, UKM Medical Centre (UKMMC), Jalan Yaacob Latiff, 56000 Kuala Lumpur, Malaysia ; International Centre for Case-Mix and Clinical Coding (ITCC), UKM Medical Centre (UKMMC), Jalan Yaacob Latiff, Cheras, 56000 Kuala Lumpur, Malaysia.