1. Determining optimal therapy;Guyatt;N Engl J Med,1986
2. Single case experimental designs. strategies for studying behavior change;Barlow,1984
3. Clinical trials;Ratain;Arthritis Rheum,1990
4. Clinical epidemiology;Sackett,1991
5. A clinician’s guide for conducting randomised trials in individual patients;Guyatt;Can Med Assoc J,1988