Long-term benefits of inhaled corticosteroids in asthma: the propensity score method.
Chanoine S, Dumas O, Benmerad M, Pison C, Varraso R, Gormand F, Just J, Le Moual N, Bedouch P, Bousquet J, Kauffmann F, Pin I, Siroux V. Long-term benefits of inhaled corticosteroids in asthma: the propensity score method. Pharmacoepidemiol Drug Saf. 2015 Mar; 24(3):246-55.