Search the entire Understanding Patient Data site Search Reducing nationwide variation in stroke prevention and treatment Equal access to bowel cancer treatments in Yorkshire Demonstrating the safety of an anti-obesity medication Monitoring joint replacement surgery Comparing the uptake of emergency operations for heart attack across England Using data to plan services for people living with and beyond cancer Comparing cancer survival rates worldwide The impact of air pollution on health Disproving the link between the MMR vaccine and autism Investigating trends in diabetes across ethnic groups