Article History
Received: 29 March 2019
Accepted: 27 July 2019
First Online: 16 September 2019
Competing Interests
: G. Liu and G. L. Prasad are full-time employees of RAI Services Company. RAI Services Company is a wholly owned subsidiary of Reynolds American Inc., which is a wholly owned subsidiary of British American Tobacco plc. Elements of this work were performed by S. Arimilli under a collaborative research contract at Wake Forest University Health Sciences, and by E. Savage through a contract research agreement with Genome Explorations.