1. Institute of Drug Research, School of Pharmacy-Faculty of Medicine, Center for Nanoscience & Nanotechnology and the Alex Grass Center for Drug Design and Synthesis, The Hebrew University of Jerusalem, Jerusalem; 91120 Israel
2. Strauss-Water Co, R&D Laboratories; Petach Tikva Israel
3. Department of Prosthodontics, Faculty of Dentistry; The Hebrew University-Hadassah Jerusalem, Jerusalem; 91120 Israel