EXHIBIT 99.6
JOINT FILING AGREEMENT
The undersigned acknowledge and agree that the foregoing statement on Schedule 13D is filed on behalf of each of the undersigned and that all subsequent amendments to this statement on Schedule 13D shall be filed on behalf of each of the undersigned without the necessity of filing additional joint filing agreements. The undersigned acknowledge that each shall be responsible for the timely filing of such amendments, and for the completeness and accuracy of the information concerning him, her or it contained herein and therein, but shall not be responsible for the completeness and accuracy of the information concerning the others, except to the extent that he or it knows or has reason to believe that such information is inaccurate.
Dated December 3, 2018
| NESTLE HEALTH SCIENCE US HOLDINGS, INC. | ||
| By: | /s/ James Pepin | |
| Name: James Pepin | ||
| Title: President | ||
| NIMCO US, INC. | ||
| By: | /s/ Alan Pasetsky | |
| Name: Alan Pasetsky | ||
| Title: Vice President and Assistant Treasurer, Taxes | ||
| NESTLÉ S.A. | ||
| By: | /s/ David P. Frick | |
| Name: David P. Frick | ||
| Title: Secretary to the Board of Directors | ||
