1. Department of Nursing Science, Faculty of Medicine, Universiti Malaya, Kuala Lumpur 50603, Malaysia
2. Department of Social and Preventive Medicine, Faculty of Medicine, Universiti Malaya, Kuala Lumpur 60503, Malaysia
3. Scientific Research and Postgraduate, Islamic University of Gaza, Gaza City 00972, Palestine
4. Department of Medicine, Universiti Kebangsaan Malaysia Medical Centre, Kuala Lumpur 56000, Malaysia