TY - JOUR AU - Boyington, Josephine E. A. AU - Czajkowski, Susan PY - 2013 TI - Enrollment and Retention Challenges in Early-Phase Intervention Development Studies: The Obesity-Related Behavioral Intervention Trials (ORBIT) T2 - Preventing Chronic Disease JO - Prev Chronic Dis SP - E32 VL - 10 CY - Centers for Disease Control and Prevention, Atlanta, Georgia 30333, USA. N2 - SN - 1545-1151 UR - http://dx.doi.org/10.5888/pcd10.130040 DO - 10.5888/pcd10.130040 ER -