[1] Univ Lausanne, CHU Vaudois, Dept Pediat, Pediat Gastroenterol Unit, CH-1011 Lausanne, Switzerland
[2] Univ Lausanne, CHU Vaudois, Inst Pathol, CH-1011 Lausanne, Switzerland
[3] Univ Lausanne, CHU Vaudois, Pediat Infect Dis Unit, Dept Pediat, CH-1011 Lausanne, Switzerland
[4] Univ Lausanne, CHU Vaudois, Inst Microbiol, CH-1011 Lausanne, Switzerland