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An Open-Label Pilot Study to Evaluate the Efficacy of Sildenafil Citrate in Middle-Aged Men With Late-Onset DysthymiaORR, Guy; SEIDMAN, Stuart N; WEISER, Mark et al.The Journal of nervous and mental disease. 2008, Vol 196, Num 6, pp 496-500, issn 0022-3018, 5 p.Article
