This is likely happening because you have conducted a basic search. Terms cannot be joined using the 'and' or 'or' buttons in Medline Ovid's "basic" search interface. You can only join lines in your search history if you use the Advanced Search tab.
This is likely happening because you have conducted a basic search. Terms cannot be joined using the 'and' or 'or' buttons in Medline Ovid's "basic" search interface. You can only join lines in your search history if you use the Advanced Search tab.
