[JOINT FILING AGREEMENT Dated: February 4, 2015 ATRIX ARTNERS HINA M Yibo Shao Director ATRIX ARTNERS HINA M Yibo Shao Director ATRIX HINA ANAGEMENT M Yibo Shao Director ATRIX HINA TD M Yibo Shao Director IBO HAO Y EX-99.I 2 d865386dex99i.htm EX-99.I] [CUSIP No. 163075 10 4 1. Names of Reporting Persons Matrix Partners China I, L.P. 2. Check the Appropriate Box if a Member of a Group (See Instructions) ¨ x (a) 3. SEC Use Only 4. Citizenship or Place of Organization Cayman Islands Number of Shares Beneficially Owned by Each Reporting Person With 5. Sole Voting Power 0 6.]