Medline

Medline is the leading information source in the subject area of medicine and contains a large number of references in medicine, nursing, care, odontology, health and nursing care, psychiatry etc. 

Nearly all (99%) of the titles in Medline are peer reviewed, no peer reviewed limiter is necessary. ProQuest UI offers this functionality, but its usage with the Medline database can lead to unexpected and even incorrect results, since Medline does not have any function where information about Peer Review exists.