Brown JP, Amaechi BT, Bader JD, Shugars D, Vollmer WM, Chen C, Gilbert GH, Esterberg EJ, X-ACT Collaborative Research Group. The dynamic behavior of the early dental caries lesion in caries-active adults and implications. Community Dent Oral Epidemiol. 2015 Jun;43(3):208-16. doi: 10.1111/cdoe.12143
Groenwold R, Uddin M, Roes K, de Boer A, Rivero-Ferrer E, Martin E, Gatto N, Klungel O. Instrumental variable analysis in randomized trials with non-compliance and observational pharmacoepidemiologic studies. OA Epidemiology. 2014 May 9;2(1):9.