1 Department of Pediatric Hematology/Oncology, Cell and Gene Therapy, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy. pietro.merli@opbg.net.
2 Department of Pediatric Hematology/Oncology, Cell and Gene Therapy, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy.
3 Department of Diagnostic and Laboratory Medicine, Unit of Parasitology and Multimodal Laboratory Medicine Research Area, Unit of Human Microbiome, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy.
4 Digestive Surgery and Endoscopy Unit, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy.
5 Microbiology Unit, Fondazione Policlinico Universitario 'A. Gemelli', IRCCS, Catholic University of the Sacred Heart, Rome, Italy.
6 Department of Life Sciences and Public Health, Catholic University of the Sacred Heart, Rome, Italy.