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ROUSTIT, Matthieu; BLAISE, Sophie; ALLANORE, Yannick. Phosphodiesterase-5 inhibitors for the treatment of secondary Raynaud's phenomenon: systematic review and meta-analysis of randomised trials. Annals of the Rheumatic Diseases, 2013-10-01, roč. 72, čís. 10, s. 1696–1699. PMID: 23426043. Dostupné online [cit. 2018-02-10]. ISSN0003-4967. DOI: 10.1136/annrheumdis-2012-202836. (po anglicky)