About the Authors

David Heiden

To whom correspondence should be addressed. E-mail: dheidenpea@yahoo.com

Nathan Ford
David Wilson
William R Rodriguez
Todd Margolis
Bart Janssens
Martha Bedelu
Nini Tun
Eric Goemaere
Peter Saranchuk
Kalpana Sabapathy
Frank Smithuis
Emmanuel Luyirika
W. Lawrence Drew

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

DH developed the studies, collected and analyzed data, and prepared the manuscript. DW collected and analyzed data and helped revise the manuscript. NF, WRR, and TM analyzed data and helped write the manuscript. BJ, MB, NT, PS, FS, and EL helped with study design and data collection. EG and KS helped develop the studies and helped with data collection. WLD helped prepare the manuscript.