1. Environmental Sciences Centre EULA, Environmental Sciences Faculty, EULA, Universidad de Concepción, Casilla 160-C, Concepción, Chile
2. Civil Engineering Faculty, Hydraulic & Environmental Engineering Department, Pontificia Universidad Católica de Chile, Avda. Libertador Bernardo O'Higgins 340, Santiago, Chile
3. Pontificia Universidad Javeriana Bogotá, Chemistry Department, Science Faculty, 7th Street # 40-62, Bogotá D.C., Colombia