24
Participants
Start Date
March 10, 2017
Primary Completion Date
March 1, 2020
Study Completion Date
July 31, 2027
Sildenafil
Sildenafil, 20mg x 3 times a day for 10 weeks
Placebo
Placebo oral tablet, 3 times a day for 10 weeks
University of Texas Medical Branch, Galveston
The University of Texas Medical Branch, Galveston
OTHER