[1] Sci Res Inst Childrens Infect, St Petersburg, Russia
[2] Vavilov Inst Gen Genet, St Petersburg Branch, St Petersburg, Russia
[3] St Petersburg State Univ, St Petersburg, Russia
[4] Res Inst Phys Chem Med, Moscow, Russia
[5] Ist Super Sanita, Rome, Italy
[6] North Western State Med Univ, St Petersburg, Russia