Nasrin Zand1, Afshan Shirkavand2. 1. Medical Laser Research Center (MLRC), Academic Center for Education, Culture and Research (ACECR), Tehran, Iran. zand_nas@yahoo.com. 2. Laser and Plasma research center, Shahid Beheshti University; Medical Laser Research Center (MLRC), Academic Center for Education, Culture and Research (ACECR), Tehran, Iran.