1. Clinical trials: a practical approach;Pocock,1983
2. Statistical methods in medical research;Armitage,1994
3. Sample size requirements for evaluating a conservative therapy;Makuch;Cancer Treat Rep,1978
4. General design issues in efficacy, equivalency and superiority trials;Fleiss;J Periodontal Res,1992
5. Therapeutic equivalence: fallacies and falsification;Garrett;Stat Med,2003