December 11, 2013, Vol 310, No. 22, Pages 2363-2470

Martínez-García and coauthors assess the effect of continuous positive airway pressure treatment on blood pressure values and nocturnal blood pressure patterns in 194 Spanish patients with resistant hypertension and obstructive sleep apnea.

Courcoulas and coauthors investigated 3-year change in weight and select health parameters among 2458 participants who underwent first-time bariatric surgical procedures as part of routine clinical care by surgeons in 10 US hospitals. In an Editorial, Ikramuddin and Livingston discuss the role of bariatric surgery in the management of obesity.

To quantify trends in donor oocyte cycles in the United States and determine predictors of a good perinatal outcome among in vitro fertilization cycles using noncryopreserved embryos from donor oocytes, Kawwass and coauthors analyzed data from the National Assisted Reproductive Technology Surveillance System. Myers provides comment in the related Editorial.

To study the association between use of acid-suppressing medications and vitamin B₁₂ deficiency, Lam and coauthors conducted a case-control study to compare exposures and outcomes among 25 956 patients having incident diagnoses of vitamin B₁₂ deficiency with those among 184 199 patients without B₁₂ deficiency.