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Exhibit 99.1
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 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: June 25, 2019
| ABC BETEILIGUNGEN AKTIENGESELLSCHAFT | ||
| By: | /s/ Rolf Birkert | |
| Rolf Birkert | ||
| DEUTSCHE BALATON BIOTECH AG | ||
| By: | /s/ Rolf Birkert | |
| Rolf Birkert | ||
| PRISMA EQUITY AG | ||
| By: | /s/ Jens Jüttner | |
| Jens Jüttner | ||
| SPARTA AG | ||
| By: | /s/ Jens Jüttner | |
| Jens Jüttner | ||
| DEUTSCHE BALATON AKTIENGESELLSCHAFT | ||
| By: | /s/ Rolf Birkert | |
| Rolf Birkert | ||
| VV BETEILIGUNGEN AKTIENGESELLSCHAFT | ||
| By: | /s/ Wilhelm Konrad Thomas Zours | |
| Wilhelm Konrad Thomas Zours | ||
| DELPHI UNTERNEHMENSBERATUNG AKTIENGESELLSCHAFT | ||
| By: | /s/ Wilhelm Konrad Thomas Zours | |
| Wilhelm Konrad Thomas Zours | ||
| JENS JÜTTNER | ||
| /s/ Jens Jüttner | ||
| ROLF BIRKERT | ||
| /s/ Rolf Birkert | ||
| WILHELM KONRAD THOMAS ZOURS | ||
| /s/ Wilhelm Konrad Thomas Zours | ||