Gamble J-M, McAlister FA, Johnson JA, Eurich DT. Clinical Therapeutics. Restrictive Drug Coverage Policies can Induce Substantial Drug Exposure Misclassification in Pharmacoepidemiologic Studies [Internet]. 2012;Available from: http://www.scopus.com/inward/record.url?eid=2-s2.0-84862127955&partnerID=MN8TOARS