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Effects of oral contraceptives containing ethinylestradiol with either drospirenone or levonorgestrel on various parameters associated with well-being in healthy women: a randomized, single-blind, parallel-group, multicentre study.
Kelly S, Davies E, Fearns S, McKinnon C, Carter R, Gerlinger C, Smithers A. Kelly S, et al. Among authors: smithers a. Clin Drug Investig. 2010;30(5):325-36. doi: 10.2165/11535450-000000000-00000. Clin Drug Investig. 2010. PMID: 20384388 Clinical Trial.
Tiotropium versus salmeterol for the prevention of exacerbations of COPD.
Vogelmeier C, Hederer B, Glaab T, Schmidt H, Rutten-van Mölken MP, Beeh KM, Rabe KF, Fabbri LM; POET-COPD Investigators. Vogelmeier C, et al. N Engl J Med. 2011 Mar 24;364(12):1093-1103. doi: 10.1056/NEJMoa1008378. N Engl J Med. 2011. PMID: 21428765 Free article. Clinical Trial.
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