Do You Have Questions on Heart Health?

Do you have questions about preventing and treating heart disease?

ABC News' medical editor Dr. Timothy Johnson will answer your questions.

As medical editor for ABC News, Dr. Tim provides on-air medical analysis for "World News With Charles Gibson," "Nightline" and "20/20." He has provided commentary on medical problems and answers for viewers of ABC News' "Good Morning America" since the program's debut in 1975.

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