Table 4.

List of high-frequency keywords.

Keyword	Occurrences	Total link strength	Keyword	Occurrences	Total link strength
Asthma	779	6123	early-life	192	1664
Gut microbiota	483	3663	disease	165	1224
Microbiome	309	2577	exposure	164	1376
Microbiota	276	2190	inflammation	141	1078
Children	243	2056	diversity	139	1081
Intestinal microbiota	235	1932	bacteria	121	947
Childhood asthma	214	1786	health	118	939
Allergy	210	1935	chain fatty-acids	102	741
Risk	204	1675	airway inflammation	95	723