What search feature/option is available at Medline OVID but is not available at PubMed?

Medline OVID allows proximity or adjacency searching while PubMed does not. This means that you can type Adj in between two search words (or terms) to find articles containing these two words next to each other (and in any order).
Also, this adjacency searching allows users to specify the maximum numbers of words (between 1 and 99) coming in between these two terms.

       ex. heart Adj2 surgery

retrieves articles containing the two words heart and surgery with maximum number of one word coming in between them; Adj3 retrieves words with a maximum of 2 words coming in between them, and so on…