1. CPDM, Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur, Malaysia
2. Mechanical Engineering Department, Faculty of Engineering, Universitas Muhammadiyah Yogyakarta, Yogyakarta, Indonesia
3. Mechanical and Industrial Engineering Department, Faculty of Engineering, Universitas Gadjah Mada, Yogyakarta, Indonesia
4. Department of Mental Health Nursing, School of Nursing, Universitas Muhammadiyah Yogyakarta, Yogyakarta, Indonesia.