Comment on

• Is there a place for the crossover design in infertility trials?

  Daya S. Daya S. Fertil Steril. 1993 Jan;59(1):6-7. doi: 10.1016/s0015-0282(16)55609-x. Fertil Steril. 1993. PMID: 8419222 No abstract available.
• Empirical evidence of bias in infertility research: overestimation of treatment effect in crossover trials using pregnancy as the outcome measure.

  Khan KS, Daya S, Collins JA, Walter SD. Khan KS, et al. Fertil Steril. 1996 May;65(5):939-45. doi: 10.1016/s0015-0282(16)58265-x. Fertil Steril. 1996. PMID: 8612853 Clinical Trial.
• Crossover or parallel design in infertility trials? The discussion continues.

  Cohlen BJ, te Velde ER, Looman CW, Eijckemans R, Habbema JD. Cohlen BJ, et al. Fertil Steril. 1998 Jul;70(1):40-5. doi: 10.1016/s0015-0282(98)00114-9. Fertil Steril. 1998. PMID: 9660418