Acknowledgements
We thank the patients who participated in the study and their supportive families, as well as the investigators and clinical research staff from the study centers. The authors thank Harisha Atluri, PhD (employed with AbbVie), for assistance with pharmacokinetic data analysis; and Gary Acton, MD (contracted with AbbVie), for critical review of the manuscript. Medical writing support was provided by Cindi A. Hoover, PhD, and funded by Pharmacyclics LLC, an AbbVie Company.