---------------------------------------------------------Esercizio 3 - accorpa tre ricerche di vocaboli in free- text con gli operatori boleani -----------------------------------------------------------
#4 #3 #2 #1
#1 OR #2 OR #3 Search hypercholesterolemic[tiab] Search hypercholesterolaemia[tiab] Search hypercholesterolemia[tiab]
18310 4219 3088 12816
#4 #3 #2 #1
#1 AND #2 AND #3 Search hypercholesterolemic[tiab] Search hypercholesterolaemia[tiab] Search hypercholesterolemia[tiab]
4 4219 3088 12816
#4 #1 NOT #2 NOT #3 #3 Search hypercholesterolemic[tiab] #2 Search hypercholesterolaemia[tiab] #1 Search hypercholesterolemia[tiab]
2519 4219 2997 12272
5