Long-term effects of asthma medication on asthma symptoms: an application of the targeted maximum likelihood estimation. - Veit, Carolin; Herrera, Ronald; Weinmayr, Gudrun; Genuneit, Jon; Windstetter, Doris; Vogelberg, Christian; von Mutius, Erika; Nowak, Dennis; Radon, Katja; Gerlich, Jessica; Weinmann, Tobias (BMC Medical Research Methodology, 2020)