[POWER OF ATTORNEY whether the same needs to be executed, taken or done by him in his capacity as a current or former member, partner, shareholder, director or officer of any company, partnership, corporation, organization, firm, branch or other entity connected with, related to or affiliated with any of the entities constituting the Carlyle Companies or entities that directly or] [JOINT FILING AGREEMENT CARLYLE GROUP MANAGEMENT L.L.C. Daniel D’Aniello Chairman THE CARLYLE GROUP L.P. Daniel D’Aniello Chairman CARLYLE HOLDINGS II GP L.L.C. Daniel D’Aniello Chairman CARLYLE HOLDINGS II L.P. Daniel D’Aniello Chairman] [SCHEDULE 13G CUSIP No. 206277105 Page 1 of 16 1 Names of reporting persons The Carlyle Group L.P. 2 Check the appropriate box if a member of a group ¨ ¨ (a) 3 SEC use only 4 Citizen or place of organization Delaware]

[SCHEDULE 13G CUSIP No. 206277 105 Page 2 of 8 Pages 1 Name of reporting person China Medical Scientific Holdings Limited (Formerly known as Notable Enterprise Limited) 2 Check the appropriate box if a member of a group ¨]