Basu N, Jones GT, Macfarlane GJ, Druce KL. Identification and validation of clinically relevant clusters of severe fatigue in rheumatoid arthritis. Psychosom Med. 2017 Nov;79(9):1051-8. doi: 10.1097/PSY.0000000000000498
Hansen MK, Gammelager H, Jacobsen CJ, Hjortdal VE, Layton JB, Rasmussen BS, Andreasen JJ, Johnsen SP, Christiansen CF. Acute kidney injury and long-term risk of cardiovascular events after cardiac surgery: a population-based cohort study. J Cardiothorac Vasc Anesth. 2015 Jun;29(3):617-25. doi: 10.1053/j.jvca.2014.08.020