Background Although numerous studies suggest that there is an inverse relation between
hospital volume of surgical procedures and surgical mortality, the relative importance of …

Background Although the relation between hospital volume and surgical mortality is well
established, for most procedures, the relative importance of the experience of the operating …

Background: The health implications of regional differences in Medicare spending are unknown.
Objective: To determine whether regions with higher Medicare spending provide better …

Background: The health implications of regional differences in Medicare spending are unknown.
Objective: To determine whether regions with higher Medicare spending achieve better …

… Author Contributions: As principal investigator, Dr Stukel had full access to all of the data
in the study and takes responsibility for the integrity of the data and the accuracy of the data …

Objective To determine whether patients who are not admitted to hospital after attending an
emergency department during shifts with long waiting times are at risk for adverse events. …

Objective: To examine relationships between hospital volume and late survival after different
types of cancer resections. Design: Using the national Surveillance Epidemiology and End …

BACKGROUND & AIMS: The most widely quoted complication rates for colonoscopy are from
case series performed by expert endoscopists. Our objectives were to evaluate the rates of …

Background Non-selective, non-steroidal anti-inflammatory drugs (NSAIDs) are associated
with an increased risk of congestive heart failure, but little is known about the cardiovascular …

Background. Beta carotene has been associated with a decreased risk of human cancer in
many studies employing dietary questionnaires or blood measurements, and it has had …