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John O'Brien, MD is a Doctor primarily located in San Francisco, CA, with another office in San Francisco, CA. He has 49 years of experience. His specialties include Internal Medicine and Cardiology. John O'Brien is affiliated with John Muir Medical Center-Concord Campus, St Francis Mem Hosp, San Francisco, Ca and ST Marys Medical Center. He speaks English.
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Specialties & Expertise
John O'Brien has the following 5 areas of expertise and 2 specialties.
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Locations & Directions
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