Background Fewer girls than boys are born in India. Various hypotheses have been proposed
to explain this low sex ratio. Our aim was to ascertain the contribution of prenatal sex …

Background Angiotensin-converting enzyme (ACE) inhibitors prevent the expansion and
rupture of aortic aneurysms in animals. We investigated the association between ACE inhibitors …

Background: Tracheostomy is common in intensive care unit patients, but the appropriate
timing is controversial. Objective: To determine whether earlier tracheostomy is associated with …

Importance Self-harm behaviors, including suicidal ideation and past suicide attempts, are
frequent in bariatric surgery candidates. It is unclear, however, whether these behaviors are …

Background In 2000, Ontario, Canada, initiated a universal influenza immunization program
(UIIP) to provide free influenza vaccines for the entire population aged 6 mo or older. …

Background Physicians' warnings to patients who are potentially unfit to drive are a medical
intervention intended to prevent trauma from motor vehicle crashes. We assessed the …

Background: Head injuries have been associated with subsequent suicide among military
personnel, but outcomes after a concussion in the community are uncertain. We assessed the …

Background: Postoperative delirium after elective surgery is frequent and potentially serious.
We sought to determine whether the use of statin medications was associated with a higher …

Background The Edmonton Symptom Assessment System (ESAS) is a validated instrument
whose use has been standardized in the Ontario cancer system to measure symptoms …

Background Misdiagnosis of COPD is common. The goal of this study was to quantify the
health services burden of undiagnosed and overdiagnosed COPD in a real-world, North …