Raghunathan K, Layton JB, Ohnuma T, Shaw AD. Observational research using propensity scores. Adv Chronic Kidney Dis. 2016 Nov;23(6):367-72. doi: 10.1053/j.ackd.2016.11.010
Luciano JV, Barrada JR, Aguado J, Osma J, García-Campayo J. Bifactor analysis and construct validity of the HADS: a cross-sectional and longitudinal study in fibromyalgia patients. Psychological Assessment. 2014 Jun;26(2):395-406.
Lanza LL, McQuay LJ, Rothman KJ, Bone HG, Kaunitz AM, Harel Z, Ataher Q, Ross D, Arena PL, Wolter KD. Comment on journal review of 'Use of depot medroxyprogesterone acetate contraception and incidence of bone fracture'. J Fam Plann Reprod Health Care. 2013 Oct;39(4):306. doi: 10.1136/jfprhc-2013-100759