1. Electron Microscopy Unit, Department of Anatomy, Faculty of Medicine Khon Kaen University Mueang Khon Kaen 40002 Thailand
2. Laboratoire de Glycochimie, des Antimicrobiens et des Agroressources (LG2A) CNRS UMR 7378, Institut de Chimie de Picardie FR 3085 Université de Picardie Jules Verne 33 rue Saint Leu Amiens 80039 France
3. Departamento de Química Orgánica, Facultad de Ciencias Exactas y Naturales Universidad de Buenos Aires Buenos Aires 1428 Argentina
4. Division of Anatomy, School of Medical Sciences University of Phayao Phayao 56000 Thailand
5. Department of Anatomy, Faculty of Science Mahidol University Bangkok 10400 Thailand