1 Department of Pharmacy-Drug Sciences, University of Studies of Bari Aldo Moro, Via E. Orabona n. 4, 70125 Bari, Italy. Electronic address: giovanni.lentini@uniba.it.
2 Pharmacognosy Research Laboratories & Herbal Analysis Services, University of Greenwich, Kent ME4 4TB, UK. Electronic address: s.habtemariam@herbalanalysis.co.uk.