1. Department of Medical NutritionKarolinska Institutet, Huddinge University Hospital, NovumSE‐141 86HuddingeSweden
2. Microbiology and Tumor Biology Center (MTC), Karolinska InstitutetSE‐171 77StockholmSweden
3. Department of Immunology, School of MedicineBeijing UniversityBeijing100083People's Republic of China