1)- Thomas Crewe Dixon, Ellen Stein, Song Ngak, Chhim Srean, Phou Maly, Muth Sokunny, Adam Carrico, Kimberly Page, Lisa Maher. Qualitative research and implementation science: Informing the acceptability and implementation of a trial of a conditional cash transfer intervention designed to reduce drug use and HIV risk.Methodological innovations. 2016, 9: