Clinical Research Division of Pulmonary, Critical Care and Sleep Medicine An open-label extension trial to assess the long term safety of nintedanib in patients with "Systemic Sclerosis associated Interstitial Lung Disease" (SSC-ILD) OPEN ENROLLMENT Uptravi® (SelexiPag): tHe usErs dRug rEgistry (SPHERE) Registry Uptravi® (Selexipag) Users Registry PROTOCOL: AC-065A402