Funding for this research was provided by:
Merck Sharp and Dohme (NA)
Received: 28 June 2019
Accepted: 13 March 2020
First Online: 27 March 2020
Ethics approval and consent to participate
: Not applicable because this is a review of published literature.
: Not applicable.
: S. Merchant, G. T. Hernandez, and E. Sarpong are employees of Merck Sharp & Dohme Corp., a subsidiary of Merck & Co., Inc., Kenilworth, NJ, USA.