https://investor.ironwoodpharma.com/press-releases/press-release-details/2019/Ironwood-Pharmaceuticals-and-Alnylam-Pharmaceuticals-Enter-US-GI-Disease-Education-and-Promotional-Agreement-for-Alnylams-Givosiran-in-Acute-Hepatic-Porphyria-AHP/default.aspx