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Mayo Clinic
QJM: An International Journal of Medicine | February 1, 2017 | Volume: 36 | Issue: 1 | Pages: 1-15
10.1093/oxfordjournals.qjmed.a067096
Annals of Internal Medicine | April 12, 2013 | Volume: 63 | Issue: 6 | Pages: 1151-1155
10.7326/0003-4819-63-6-1151