Immune and Interferon Status in Schoolchildren Living in Cities with Different Anthropogenic Load - M. A. Skachkova; M. V. Skachkov; A. I. Smolyagin; V. M. Boev; N. N. Vereshchagin; I. V. Mikhailova; E. V. Popova; V. O. Skvortsov (Bulletin of Experimental Biology and Medicine, 2001)