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Svarval A. Comparison of prevalence H. pylori infection among children of St.-Petersburg, Russia at present // Helicobacter. 2019-09-05 Т.24 Sup. 1, №SI. С.4.21-90. doi:https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=tsmetrics&SrcApp=tsm_test&DestApp=WOS_CPL&DestLinkType=FullRecord&KeyUT=ISI:000486077700201