1. University of Coimbra, Laboratory of Pharmaceutical Technology, Faculty of Pharmacy, Coimbra, Portugal. ssimoes@ci.uc.pt
2. University of Coimbra, Center for Neurosciences and Cell Biology, Coimbra, Portugal
3. University of the Pacific, Department of Microbiology, School of Dentistry, San Francisco, CA 94115, USA
4. University of Coimbra, Department of Biochemistry, Coimbra, Portugal