1 Clinic of Neonatology, Department Mother-Woman-Child, Lausanne University Hospital and University of Lausanne, Lausanne CH-1011, Switzerland. Electronic address: eric.giannoni@chuv.ch.
2 Materno-Fetal and Obstetrics Research Unit, Department Mother-Woman-Child, Lausanne University Hospital and University of Lausanne, Lausanne CH-1011, Switzerland.
3 Clinic of Neonatology, Department Mother-Woman-Child, Lausanne University Hospital and University of Lausanne, Lausanne CH-1011, Switzerland.
4 Food and Nutritional Sciences, St Joseph's Hospital, University of Reading, UK.
5 Department of Microbiology and Immunology, University of Western Ontario, London, ON, Canada; Canadian R&D Centre for Human Microbiome and Probiotics, Lawson Health Research Institute, London, ON, Canada.