1 Department of Public Health Sciences, Penn State Tobacco Center of Regulatory Science, Pennsylvania State University, MC CH69, 500 University Drive, P.O. Box 850, Hershey, PA, 17033, USA. nkrebs@pennstatehealth.psu.edu.
2 Department of Public Health Sciences, Penn State Tobacco Center of Regulatory Science, Pennsylvania State University, MC CH69, 500 University Drive, P.O. Box 850, Hershey, PA, 17033, USA.
3 The Milken School of Public Health, George Washington University, 950 New Hampshire Ave, NW, Washington, D.C, 20052, USA.
4 Investigational Drug Service, Department of Pharmacy, Pennsylvania State University, 500 University Drive, P.O. Box 850, Hershey, PA, 17033, USA.
5 Department of Medicine, Pennsylvania State University, 500 University Drive, P.O. Box 850, Hershey, PA, 17033, USA.
The title of the original publication [1] had an error; furthermore there were errors in Fig. 2. The corrected version of the title and of Fig. 2 can be found below in this Erratum.