1. Departamento de Física, Facultad de Ciencias Naturales; Universidad de Oriente; CP-90500 Santiago de Cuba Cuba
2. Department of Chemistry; KU Leuven; 3000 Leuven Belgium
3. Department of Engineering; University of Cambridge; Cambridge CB2 1PZ United Kingdom
4. Department of Pharmaceutics and Pharmacological Sciences; Rega Institute for Medical Research, KU Leuven; 3000 Leuven Belgium