We would like to thank Karina M. Yelin, Milton Sanchez, Juan Rabionet, Steven Llanes, and Edgar Estrada for their assistance. A very special thanks goes to Yalila Castellon for her secretarial support, to Mathew N. Alfonso and Daniel T. Alfonso for their help with the computer, and to Dr Juan Di Domenico for the spanish translation. We also acknowledge the following individuals for their contributions to the 2006 edition:

Jose Adams, M.D.
Donald Altman, M.D.
Nolan N. Altman, M.D.
Luis A. Alvarez, M.D.
Maria Arias, M.D.
Hugo A. Arroyo, M.D.
Carol D. Brathwaite, M.D.
Kenneth Butler, M.D.
Manuel A. Campo, M.D.
Omar Costa-Cruz, M.D.
Robert F. Cullen, M.D.
Gonzalo De Quesada, M.D. Marcel J. Deray, M.D.
Gisella Diaz-Monroig, M.D.
Catalina Dunoyer, M. D.
Mark Epstein, M.D.
Felix Estrada, M.D.
Enrique Canton, M.D.
Carlos A. Gadia, M.D.
Olga C. Garcia, M.D.
John A. I. Grossman, M.D.
Parul B. Jayakar, M.D.