1. van Oppen P, van Balkom AJ, Smit JH, Schuurmans J, et al. (2010). Does the therapy manual or the therapist matter most in treatment of obsessive-compulsive disorder? A randomized controlled trial of exposure with response or ritual prevention in 118 patients. Journal of Clinical Psychiatry 71(9):1158-67.
2. Wiersma JE, van Schaik DJ, van Oppen P, McCullough JP, Jr., et al. (2008). Treatment of chronically depressed patients: a multisite randomized controlled trial testing the effectiveness of 'Cognitive Behavioral Analysis System of Psychotherapy' (CBASP) for chronic depressions versus usual secondary care. BMC Psychiatry 8(18).
3. Welschen LMC, Van Oppen P, Dekker JM, Bouter LM, et al. (2007). The effectiveness of adding cognitive behavioural therapy aimed at changing lifestyle to managed diabetes care for patients with type 2 diabetes: Design of a randomised controlled trial. BMC Public Health .
4. Welschen LM, van Oppen P, Dekker JM, Bouter LM, et al. (2007). The effectiveness of adding cognitive behavioural therapy aimed at changing lifestyle to managed diabetes care for patients with type 2 diabetes: design of a randomised controlled trial. BMC Public Health 7(74).
5. van Boeijen CA, van Oppen P, van Balkom AJLM, Visser S, et al. (2005). Treatment of anxiety disorders in primary care practice: A randomised controlled trial. British Journal of General Practice 55(519):763-769.
6. van Boeijen CA, van Oppen P, van Balkom AJLM, Visser S, et al. (2005). Treatment of anxiety disorders in primary care practice: A randomised controlled trial. British Journal of General Practice 55(519):763-769.
