Steinberg MH: Management of sickle cell disease [review]. .N Engl J Med 340::1021. ,1999. .
Platt OS, Brambilla DJ, Rosse WF, et al: Mortality in sickle cell disease: life expectancy and risk factors for early death. .N Engl J Med 330::1639. ,1994. .
Frost ML, Treadwell P: Treatment of sickle cell leg ulcers with pentoxifylline. .Int J Dermatol 29::375. ,1990. .