Choudhry NK, Denberg TD, Qaseem A, for the Clinical Guidelines Committee of the American College of Physicians Ann Intern Med 2016;164:41-9 http://annals.org/article.aspx?articleID=2471597
Regensteiner JG, Golden S, Huebschmann AG, et al. Circulation. Published on line December 7, 2015 http://circ.ahajournals.org/content/early/2015/12/06/CIR.0000000000000343
Nicolaas P. Pronk, Patrick L. Remington on behalf of the Community Preventive Services Task Force Ann Intern Med. 2015;163(6):465-468. Sept 15, 2015 http://annals.org/article.aspx?articleID=2395731