I`m an Imam (person leading people in prayer), and not long ago, I suffered from hardening of arteries (arteriosclerosis) and high blood pressure (hypertension), and was given the proper medications. However, as these diseases affect memory, I sometimes forget the verses that I want to recite during prayer. Is it permissible that I read from the Mus-haf (Quran) during obligatory prayer, taking into consideration the fact that the Mus-haf is in a raised place, and not held in my hand?