RT Journal Article SR Electronic T1 Thermographic and symptomatic effect of a single dose of sildenafil citrate on Raynaud's phenomenon in patients with systemic sclerosis: a potential treatment. JF The Journal of Rheumatology JO J Rheumatol FD The Journal of Rheumatology SP 1918 OP 1919 VO 33 IS 9 A1 Namita Kumar A1 Bridget Griffiths A1 John Allen YR 2006 UL http://www.jrheum.org/content/33/9/1918.abstract AB