1. Department of Public Health College of Medicine National Cheng Kung University Tainan Taiwan
2. Taiwan Love and Hope Association Kaohsiung Taiwan
3. Healing, Empowerment, Recovery of Chemsex (HERO) Health Center HÉROS Kaohsiung Taiwan
4. Department of Community Psychiatry Kaohsiung Municipal Kai‐Syuan Psychiatric Hospital Kaohsiung Taiwan
5. Department of Nursing College of Medicine National Cheng Kung University Tainan Taiwan