Exhibit 99.1
JOINT FILING AGREEMENT
The undersigned hereby agree that the statement on Schedule 13G to which this Agreement is annexed as Exhibit 99.1, and any amendments thereto, is and will be filed on behalf of each of them in accordance with the provisions of Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended.
Dated: March 26, 2020
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| | PFIZER INC.
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| | By: | /s/ Susan Grant |
| | Name: | Susan Grant |
| | Title: | Assistant Secretary |
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| | PFIZER VENTURES (US) LLC |
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| | By: | /s/ Susan Grant |
| | Name: | Susan Grant |
| | Title: | Secretary |
