Factors associated with neurofeedback and mindfulness-based combination therapy for patients with substance use disorder: A multicenter study Chih-Hsiang Chiu; Frank Huang-Chih Chou; Hung-Chi Wu; Chih-Hung Ko; Meng-Chang Tsai; Jui-Kang Tsai; Chih-Yao Hsu; Kuan-Shang Chung; Yu-Shi Lu; Dian-Jeng Li;