TY - JOUR AU - Dilts, DM; Sandler, AB TI - Invisible barriers to clinical trials: the impact of structural, infrastructural, and procedural barriers to opening oncology clinical trials JO - J Clin Oncol VL - 24 PY - 2006 DO - 10.1200/JCO.2005.05.0104 L3 - PubMed-ID: 17008693 SP - 4545 EP - 4552. ER -