1. CPDM, Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur, Malaysia
2. Department of Mechanical Engineering, Faculty of Engineering, Universitas Muhammadiyah Yogyakarta, Daerah Istimewa Yogyakarta, Indonesia
3. Department of Mental Health Nursing, School of Nursing, Universitas Muhammadiyah Yogyakarta, Daerah Istimewa Yogyakarta, Indonesia.