Vitamin D levels and effects of vitamin D replacement in children with periodic fever, aphthous stomatitis, pharyngitis, and cervical adenitis (PFAPA) syndrome
作者单位：Health's Sciences Department, University of Florence, Anna Meyer Children's University Hospital[1]Institute of Pediatrics, Università Cattolica Sacro Cuore, Rome, Italy[2]Department of BioMedicine, Section of Rheumatology, Transition Clinic, University of Florence[3]
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