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
Frye S, Crosby M, Edwards TP, Juliano R. US academic drug discovery. Nat Rev Drug Discov. 2011 Jun 1;10(6):409-10. doi: 10.1038/nrd3462