1. Selection bias in clinical trials;Antman;J. Clin. Oncol.,1985
2. Participation and successful patient recruitment in primary care;Wit;J.Fam.Pract.,2001
3. Barriers to clinical trial participation by older women with breast cancer;Kemeny;J Clin Oncol,2003
4. Kuyvenhoven M Dagnilie C Melker R Recruitment of general practitioners and patients in a sore throat study (Letter) Br.J.Gen.Pract 1997 126 127
5. Recruitment of patients to cooperative group clinical trials;Lee;Cancer Clin.Trials,1980