Validity of tortuosity severity index in chest pain patients with abnormal exercise test and normal coronary angiography. Research Authors AKM Hassan, H Abd–El Rahman, SG Hassan, TAN Ahmed, AAA Youssef Research Date Thu, 26 Jul 2018 - 12:00 Research Journal The Egyptian Heart Journal 70 (4), 381-387 Research Member Tarek Abdel-Hameed Nagib Ahmed Research Year 2018