TY - JOUR T1 - Health research among hard-to-reach people: six degrees of sampling JF - Canadian Medical Association Journal JO - CMAJ SP - 1145 LP - 1149 DO - 10.1503/cmaj.141076 VL - 187 IS - 15 AU - Mary Aglipay AU - John L. Wylie AU - Ann M. Jolly Y1 - 2015/10/20 UR - http://www.cmaj.ca/content/187/15/1145.abstract N2 - ER -