Domdey A, Njue A, Nuabor W, Lyall M, Heyes A, Elliott L. Allergy immunotherapies for allergic rhinitis: systematic review and assessment of evolving quality. Eur Ann Allergy Clin Immunol. 2019 Jul;51(4):147-58. doi: 10.23822/EurAnnACI.1764-1489.100
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