No securities are beneficially owned.
Please see Joint Filer Information Statement attached as Exhibit 99 hereto. Jonathan Leff, a partner in Deerfield Management Company, L.P. serves as a director of the Issuer. This Form 3 is being filed by the undersigned as well as the entities listed on the Joint Filer Information Statement attached as an exhibit hereto (the "Reporting Persons"). Deerfield Mgmt III, L.P. is the general partner of Deerfield Private Design Fund III, L.P. ("Fund III"). Deerfield Mgmt HIF, L.P. is the general partner of Deerfield Healthcare Innovations Fund, L.P. ("Deerfield Innovations"). Deerfield Mgmt, L.P. is the general partner of Deerfield Partners, L.P. (collectively with Fund III and Deerfield Innovations, the "Funds"). Deerfield Management Company, L.P. is the investment manager of the Funds. James E. Flynn is the sole member of the general partner of each of Deerfield Mgmt III, L.P., Deerfield Mgmt HIF, L.P., Deerfield Mgmt, L.P. and Deerfield Management Company, L.P. Exhibit 24 - Power of Attorney.