[1] Univ Kebangsaan Malaysia, Speech Sci Programme, Fac Hlth Sci, Ctr Hlth Ageing & Wellness H CARE, Jalan Raja Muda Abdul Aziz, Kuala Lumpur 50300, Malaysia
[2] Texas Tech Univ, Inst Measurement Methodol Anal & Policy, Lubbock, TX 79409 USA
[3] Texas Tech Univ, Inst Measurement Methodol Anal & Policy, Dept Educ Psychol & Leadership, Lubbock, TX 79409 USA
[4] Univ Kebangsaan Malaysia, Fac Hlth Sci, Speech Sci Programme, Kuala Lumpur, Malaysia
[5] Univ Kebangsaan Malaysia, Fac Hlth Sci, Ctr Rehabil & Special Needs, Clin Psychol Programme, Kuala Lumpur, Malaysia