Improving the validity of treatment effect estimates from observational data of uncommon diseases. The scleroderma lung transplant survival model.

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Scleroderma (also called Systemic Sclerosis (SSc)) is a disease that can affect the skin, joints and internal organs (heart, lungs, kidneys). There is no cure. The leading cause of death for Canadians with SSc is end-stage lung disease from high pressure