1. Department of Parasitology, University of Granada, Severo Ochoa s/n, E-18071 Granada, Spain
2. Department of Organic Chemistry, University of La Laguna, Instituto Universitario de Bioorgánica “Antonio González”, E-38206 La Laguna, Tenerife, Spain
3. Department of Statistics, University of Granada, Severo Ochoa s/n, E-18071 Granada, Spain