Acknowledgments
The authors thank the patients and their families, investigators, co-investigators, and study teams at each of the participating centers and at Merck. This study was funded by Merck (CrossRef Funder ID: 10.13039/100009945) and was previously part of an alliance between Merck and GlaxoSmithKline. Medical writing support was provided by Erika Young of Clinical Thinking, Inc, and funded by Merck and GlaxoSmithKline in accordance with Good Publication Practice guidelines (