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The Boston Globe

Health & wellness

A closer look at the criticisms of chelation

Looking at the flaws raised by Cleveland Clinic Cardiologist Steven Nissen — and the answers offered by study participants — offers some insight into what makes a study valid and trustworthy.

Many of the clinics that conducted the trials were alternative therapy clinics and had not done research before. A clinical trial is only as reliable as the centers where it is conducted, and weak sites mean a weak study, Nissen said.

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