We have read with great interest the Clinical Opinion recently published on menstrual preconditioning for the prevention of pregnancy complications in women with polycystic ovary syndrome (PCOS). This paper provides…

We thank these authors for their interest in our paper. We are indeed proposing to examine whether pH adds to the predictive value of base deficit, and this analysis is planned….

Because we should all be precise with the nomenclature that we use, I want to bring attention to the article by Greenwald et al, in that the authors use the term…

We thank Dr Ben-Shlomo and colleagues for their interest regarding our article and we would like to reply to some of the comments expressed in their letter titled “Does twin…

Reading the observational documentation of multiple parameters of cardiovascular function in twin pregnancies by Ghi et al we would like to raise a serious concern. They observed deterioration during pregnancy in…

This letter to the editor addresses points that were clearly stated in the article. Here are the responses point-by-point to this letter: (I) The purpose of this randomized controlled trial…

Randomized controlled trials (RCTs) are the gold standard of study design, but they achieve this goal only if rules of good study design are followed. Deviations can cause significant damage,…

We appreciate the comments by Vidulich et al concerning the role of heterosexual anal intercourse (HAI) in anal human papillomavirus (HPV) acquisition. We agree that HAI is likely underreported, and that…