Serum vitamin D levels in patients with Bell’s palsy: a systematic review and meta-analysis by Elaheh Foroughi, Mehrdad Mozafar, Shayesteh Haghighi, Maryam Moghbel Baerz, Kosar Salehi Torabi, Aref Hafezi Bafti, Fatemeh Asadi, Mani Khorsand Askari, Erfan Shahabinejad

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