Current consequences of "Boolean" intuitions

In the recent few years, the on-line electronic search for biomedical and, more in general, health information has remarkably developed. The majority of currently available search tools provide Internet users with various ‘‘Boolean’’ search options as a modality for constructing specific research questions. Many electronic searchers are nowa days largely familiar with common Boolean operators, including the well-known AND, OR, NOT, which may be adopted to combine searches and to implement search limits.