This is a "connection" page, showing publications co-authored by Caleb Alexander and Xuejie Zhang.
Characteristics of patients receiving pharmaceutical samples and association between sample receipt and out-of-pocket prescription costs. Med Care. 2008 Apr; 46(4):394-402.
The connection strength for concepts is the sum of the scores for each matching publication.
Publication scores are based on many factors, including how long ago they were written and whether the person is a first or senior author.