[1] Univ Malaya, Fac Med, Dept Nursing Sci, Kuala Lumpur 50603, Malaysia
[2] Univ Putra Malaysia, Fac Med & Hlth Sci, Dept Nursing, Serdang, Malaysia
[3] Univ Putra Malaysia, Fac Med & Hlth Sci, Dept Anaesthesiol, Serdang, Malaysia
[4] Sunway Univ, Dept Nursing, Sch Med & Life Sci, Subang Jaya, Selangor, Malaysia