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L.S. Ovcharenko, D.M. Sheludko, A.O. Vertehel, I.V. Samokhin, T.G. Andrienko, A.V. Kryazhev. "Neurotransmitter serum levels in children with recurrent upper respiratory tract infections." Zdorovʹe Rebenka 14.4 (2019) 205-210