1. Ethical considerations and potential threats to validity for three methods commonly used to collect geographic information in studies among people who use drugs. (October 2016) Authors: Rudolph, Abby E.; Bazzi, Angela Robertson; Fish, Sue Journal: Addictive behaviors Issue: Volume 61(2016) Page Start: 84 Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗