This group will include the representatives participating of the following countries: for United States and for Europe, where the principal function of this group will be analysis, of all problems related to this study and for consultation with respect to opinion or critical ideas for the final results.

With Respect the Statistical Analysis: We invited for the analysis of our study, Thomas SONGER and Prof. Jess KRAUS, from United States, because we intend that they have a great experience on this field.