2Warlow C. Advanced issues in the design and conduct of randomized clinical trials: the bigger, the better? Statistics in Medicine 2002 ; 21 : 2797--2805.
3Carlin JB, Doyle LW. Statistics for clinicians. 7: Sample size. J Paediatr Child Health 2002 ; 38 : 300--304.
4Pocock SJ. Clinical trims: A practical approach. 1st edition. Chichester: John Wiley & Sons Ltd. England, 1983:123--141.
5Millar JA, Burke V. Relationship between sample size and the definition of equivalence in non-inferiority drug studies. Journal of Clinieal Pharmaey and Therapeutics 2002;27:329--333.
6Smith C, Burley C, Ire.son M, et al. Clinical trials of antibacterial agents: a practical guide to design and analysis. Journal of Antimicrobial Chemotherapy 1998;41:467--480.
7Jones B, Jarvis P, Lewis JA, et al. Trials to assess equivalence: the importance of rigorous methods. BMJ 1996;313:36--39.
