????? ??? ???? ???? ???, ?? ???? ??? ???? ????. ??? ????? ??? ????, ??? ??? ??? ??? ??? ? ??. ????? ?????? ?? ??? ???? ???, ??? ??? ?? ?? ??? ??? ???? ????? ??? ?? ?? ? ?? ??? ?? ??? ?????. ??, ???? ??? ??? ??? ??? ? ? ????. ????? ???? ???? one of the most serious risk factors is ????? ???? ?? ??? ???. ??? ??? ??? ?? ????? ??? ?? ?? ????. ?? ???