The Effect of Vitamin a Supplementation on Disease Progression, Cytokine Levels and Gene Expression in Multiple Sclerotic Patients: Study Protocol For a Randomized Controlled Trial by Mohammad Hassan Harrirchian, Niyaz Mohammadzadeh Honarvar, Fariba Koohdani, Sama Bitarafan, Fereydoon Siassi, Sima Jafarirad, Mina Abdolahi, Eisa Salehi, Mohammad Ali Saharian, Homa Rouystaee, Mohammad Reza Eshraghian, Ali Akbar Saboor-Yarghi

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