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Nighttime features derived from topic models for classification of patients with COPD. - Gabriele Spina; Pierluigi Casale; Paul S. Albert; Jennifer Alison; Judith Garcia-Aymerich; Christian F. Clarenbach; Richard W. Costello; Nidia A. Hernandes; Jorg D. Leuppi; Rafael Mesquita; Sally J. Singh; Frank W. J. M. Smeenk; et al. (Comput. Biol. Medicine, 2021)