Administration, Oral 1 Adult 1 Article 1 Buprenorphine 1 Drug Administration Schedule 1 Drug Implants 1 Female 1 Heroin 1 Humans 1 Injections 1 Logistic Models 1 Male 1 Narcotic Antagonists 1 Opiate Substitution Treatment 1 Opioid agonist treatment Opioid-Related Disorders 1 Opioids 1 Patient Preference 1 Substance Withdrawal Syndrome 1 Tablets 1 Young Adult 1 adult 1 buprenorphine 1 buprenorphine plus naloxone 1 clinical trial 1 comparative study 1 drug abuse 1 drug administration 1 drug formulation 1 drug implant 1