1. Northwest Public Health Research Center, St. Petersburg, Russia
2. Dubna City Hospital, Moscow Oblast, Russia
3. Division of Nutritional ResearchDepartment of Public Health and Clinical Medicine, Umeå University, Umeå, Sweden
4. Arcum – Arctic Research Centre , Umeå University, Umeå, Sweden
5. Division of Infectious DiseasesDepartment of Clinical Microbiology, Umeå University, Umeå, Sweden