Groenwold RH, Klungel OH, Altman DJ, van der Graaf Y, Hoes AW, Moons KG, Rivero E, Fortuny J, PROTECT WP2. Adjustment for continuous confounders: an example of how to prevent residual confounding. Can Med Assoc J. 2013 Mar 19;185(5):401-6. doi: 10.1503/cmaj.120592
Huybrechts KF, Rothman KJ, Silliman RA, Brookhart MA, Schneeweiss S. Risk of death and hospital admission for major medical events after initiation of psychotropic medications in older adults admitted to nursing homes. Can Med Assoc J. 2011 Apr 1;183(7):E411-9.
Palka P, Lange A, Wright RA, Starkey IR, Fleming AD, Bouki KP, Sutherland GR, Shaw TRD, Fox KAA. Myocardial velocity gradient measured throughout the cardiac cycle in dilated cardiomyopathy hearts — a potential new parameter of systolic and diastolic myocardial function by Doppler myocardial imaging. European journal of ultrasound. 1997 Jun 1;5(3):141-54. doi: 10.1016/S0929-8266(97)00014-1
Hoskins PR, Fleming A, Stonebridge PA, Allan PL, Cameron D. Scan-plane vector maps and secondary flow motions in arteries. European journal of ultrasound. 1994 Apr 1;1(2):159-69.