Question: Peter Robert Voser was the CEO from July 2009 to December 2013 to a company headquartered in which country ?
Sentence (from "Sutro Biopharma"): Sutro Biopharma is a private biopharmaceutical company headquartered in South San Francisco that develops antibody-drug conjugate and multi-specific antibody-based therapeutics for cancer therapy.
Relevant evidence: No