1. The mythology of randomization;Abel,1998
2. Raising questions about antidepressants;Antonuccio;Psychotherapy and Psychosomatics,1999
3. Empirical research on factors in psychotherapeutic change;Arnkoff,1993
4. Why we need observational studies to evaluate the effectiveness of health care;Black;British Medical Journal,1996
5. Why we need observational studies to evaluate the effectiveness of health care;Black,1998