1. Gul RB, Ali PA: Clinical trials: the challenge of recruitment and retention of participants. J Clin Nurs. 2010, 19: 227-233.
2. Treweek S, Pitkethly M, Cook J, Kjeldstrøm M, Taskila T, Johansen M, Sullivan F, Wilson S, Jackson C, Jones R, Mitchell E: Strategies to improve recruitment to randomized controlled trials. Cochrane Database Syst Rev. 2010, 4: MR000013-
3. Wardle K, Murphy D, Ireland L, Holbeck C, Davidson C, Wen LM, Rissel C: What we learnt-recruiting prenatal mothers to an RCT addressing the prevention of overweight in early childhood?. Aust J Adv Nurs. 2010, 28: 41-45.
4. Finne E, Reinehr T, Schaefer A, Winkel K, Kolip P: Overweight children and adolescents-is there a subjective need for treatment?. Int J Public Health. 2009, 54: 112-116.
5. Baines CJ: Impediments to recruitment in the Canadian National Breast Screening Study: response and resolution. Control Clin Trials. 1984, 5: 129-140.