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Mayo Clinic
Pfizer (United States)
JAMA Internal Medicine | April 9, 2018 | Volume: 178 | Issue: 5 | Pages: 622
10.1001/jamainternmed.2018.0397
JAMA | February 17, 2015 | Volume: 313 | Issue: 7 | Pages: 687
10.1001/jama.2015.280