Relative efficacy of cash versus vouchers in engaging opioid substitution treatment clients in survey-based research
L Topp, MM Islam, CA Day - Journal of medical ethics, 2013 - jme.bmj.com
Concerns that cash payments to people who inject drugs (PWID) to reimburse research
participation will facilitate illicit drug purchases have led some ethical authorities to mandate …
participation will facilitate illicit drug purchases have led some ethical authorities to mandate …