**Conflict of interest**

Drs. Julie McKinney and M. Khalid Ijaz are engaged in R&D at Reckitt Benckiser LLC. Dr. Raymond W. Nims is employed by RMC Pharmaceutical Solutions, Inc. and received a fee from Reckitt Benckiser LLC for his role in authoring and editing the manuscript. Reckitt Benckiser LLC participated in the decision to publish.
