Background Among critically ill adults undergoing tracheal intubation, hypoxemia increases
the risk of cardiac arrest and death. The effect of preoxygenation with noninvasive ventilation…

Objectives To characterize the clinical severity of covid-19 associated with the alpha, delta,
and omicron SARS-CoV-2 variants among adults admitted to hospital and to compare the …

Importance A comprehensive understanding of the benefits of COVID-19 vaccination requires
consideration of disease attenuation, determined as whether people who develop COVID-…

Background Whether video laryngoscopy as compared with direct laryngoscopy increases
the likelihood of successful tracheal intubation on the first attempt among critically ill adults is …

This study examined relationships among individual demographics, environmental features
(eg, fast food outlet density, park land use) of residential neighborhoods and activity spaces, …

Importance Data on the efficacy of hydroxychloroquine for the treatment of coronavirus disease
2019 (COVID-19) are needed. Objective To determine whether hydroxychloroquine is an …

Pottery was a hunter-gatherer innovation that first emerged in East Asia between 20,000
and 12,000 calibrated years before present 1 , 2 (cal bp), towards the end of the Late …

Background: As SARS-CoV-2 vaccination coverage increases in the United States (US), there
is a need to understand the real-world effectiveness against severe Covid-19 and among …

Tobacco smoke and nicotine exposure during prenatal and postnatal life can impair lung
development, alter the immune response to viral infections, and increase the prevalence of …

Objective To compare the effectiveness of a primary covid-19 vaccine series plus booster
doses with a primary series alone for the prevention of hospital admission with omicron related …