References References. 1  Berlucchi M, Nicolai P. Marshallâs syndrome or PFAPA (periodic fever, aphthous stomatitis, pharyngitis, cervical adenitis) syndrome. 2  Ovetchkine P, Bry ML, Reinert P. [Marshall syndrome: results of a retrospective national survey].. 3  Kurtaran H, KaradaÃ° A, Catal F, AktaÃ¾ D. PFAPA syndrome: a rare cause of periodic fever.
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