Candell-Riera J, Ferreira-Gonzalez I, Marsal JR, Aguade-Bruix S, Cuberas-Borros G, Pujol P, Romero-Farina G, Nazarena-Pizzi M, de Leon G, Castell-Conesa J, Garcia-Dorado D. Usefulness of exercise test and myocardial perfusion-gated single photon emission computed tomography to improve the prediction of major events. Circ Cardiovasc Imaging. 2013 Jul;6(4):531-41. doi: 10.1161/CIRCIMAGING.112.000158
Drummond FJ, Sharp L, Carsin AE, Kelleher T, Comber H. Questionnaire order significantly increased response to a postal survey sent to primary care physicians. J Clin Epidemiol. 2008 Feb;61(2):177-85. doi: 10.1016/j.jclinepi.2007.04.012