Sildenafil improves skeletal muscle oxygenation during exercise in men with intermitent claudication - Roseguini, Bruno T.; Hirai, Daniel; Alencar, Maria C.; Ramos, Roberta P.; Silva, Bruno M.; Wolosker, Nelson; Neder, J. Alberto; Nery, Luiz E. (American Journal of Physiology. Regulatory, Integrative and Comparative Physiology, 2014)