About the Authors

Adi L Tarca
Vincent J Carey
Xue-wen Chen
Roberto Romero
Sorin Drăghici

To whom correspondence should be addressed. E-mail: sorin@wayne.edu

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

ALT, VJC, XwC, RR, and SD wrote various sections of the paper. VJC and ALT wrote the sample R code.