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The examination noted the president's medical history of "well-controlled hypercholesterolemia", a condition which can increase a patient's risk of a heart attack.

The study used a "campus-based research kitchen to bridge the gap between laboratory-based chamber experiments measuring pollution from different cooking methods and less well-controlled testing in domestic kitchens."

The researchers, based in the University of Birmingham's School of Geography, Earth and Environmental Sciences, used a campus-based research kitchen to bridge the gap between laboratory-based chamber experiments measuring pollution from different cooking methods and less well-controlled testing in domestic kitchens.

In the experiments the researchers cooked chicken breast using five different methods: pan frying, stir-frying, deep-fat frying, boiling and air-frying, in a well-controlled research kitchen.

But so far, with the exception of ketamine, there's not a single well-controlled study where people are totally blind to the intervention.