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Correspondence: Abdulrahman M El-Sayed ame2145@columbia.edu
AME conceived the analysis, analyzed the data, and drafted the manuscript.
CH conceived the study, coordinated data collection, and edited the manuscript.
FT, AT, and JAC coordinated data collection and edited the manuscript.
SG coordinated data collection, advised on data analysis, and edited the manuscript.
Finally, all authors read and approved the final manuscript
We thank Mr. Peter Rockers and Ms. Magdalena Paczkowski for their help and support with the data.
The authors declare that they have no competing interests.
This project was funded by NIH grants GM07863, DA 017642, DA 022720, MH082729 and MH 078152.
© 2010 El-Sayed et al; licensee BioMed Central Ltd.