1. Department of Pharmaceutical Technology and Quality Assurance, Institute of Food and Pharmaceutical Science, University of Havana, Havana, Cuba;
2. Department of Analytical Chemistry, School of Chemistry, University of Havana, Havana, Cuba;
3. Antidopping Laboratory, National Institute of Sports, Physical Culture and Recreation (INDER), Cuba;
4. Department of Chemistry, University of the Balearic Islands, Palma, Spain