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.
Frisancho AR, Juliao PC, Barcelona V, Kudyba CE, Amayo G, Davenport G, Knowles A, Sanchez D, Villena M, Vargas E, Soria R. Developmental components of resting ventilation among high- and low-altitude Andean children and adults. Am J Phys Anthropol. 1999 Jul;109(3):295-301. doi: 3.0.CO;2-U">10.1002/(SICI)1096-8644(199907)109:3<295::AID-AJPA2>3.0.CO;2-U