[1] Hosp Reg Lic Adolfo Lopez Mateos Mexico, Mexico City, DF, Mexico
[2] Hosp Salud Alergol & Inmunol, Mexico City, DF, Mexico
[3] Unidad Med Integral Alergol & Pediat, Tehuacan, Mexico
[4] Benemerita Univ Autonoma Puebla, Tehuacan, Mexico
[5] Policlin Univ Docente Previsora Camaguey Cuba, Camaguey, Cuba
[6] Clin Torre Med Ciudad Machala, Machala, Ecuador
[7] Clin Santa Rosa el Tigre Estado Anzoategui Venezu, El Tigre, Venezuela
[8] Hosp Angeles Pedregal, Mexico City, DF, Mexico
[9] Ctr Med Especialidades Sa Cv Cd Juarez Chihuahua, Ciudad Juarez, Mexico
[10] Univ Autonoma Ciudad Juarez, Ciudad Juarez, Mexico