[1] Univ Chile, Santiago, Chile
[2] Univ Chile, Unidad Estudios Comunitarios Latinoamer, Santiago, Chile
[3] Univ Andres Bello, Comunicac Social, Santiago, Chile
[4] Univ Andres Bello, Comunicac Corp & Responsabilidad Social Empresari, Santiago, Chile
[5] Inst Leones, Leon, Spain
[6] AIEP, Valparaiso, Chile