Giang LM, Trang NT, Diep NB, Thuy DTD, Thuy DT, Hoe HD, Van HTH, Truc TT, Nguyen HH, Lai NL, Linh PTD, Vi VTT, Reback CJ, Leibowitz A, Li L, Lin C, Li M, Do Van Dung, Shoptaw S. An adaptive design to screen, treat, and retain people with opioid use disorders who use methamphetamine in methadone clinics (STAR-OM): study protocol of a clinical trial. Trials. 2022 Apr 23;23(1):342. doi: 10.1186/s13063-022-06278-w.