Table I.

Human microbiome investigation projects

Project	Population	Body site	References
MetaHIT (Metagenomics of the Human Intestinal Tract)	124 Europeans from 8 UE states (heathy subjects, patient with obesity, patients with inflammatory bowel disease)	Stool probes	http://www.metahit.eu http://www.sanger.ac.uk/resources/downloads/bacteria/metahit/ [4]
Human Microbiome Project	242 healthy adults, USA	18 body sites probes	[46]
The Global Gut Microbiome	531 healthy children and adults, Venezuela, Malawi, USA	Stool probes	[47]
American Gut Project	3832 children and adults (recruitment ongoing), USA	stool, skin, oral cavity	https://www.microbio.me/AmericanGut/static/img/mod1_main.pdf [49]