Definition: Given an abstract of a paper, generate a title for this paper such that conveys the key focus of the paper.
Input: Abstract: Endomyocardial biopsy is most frequently used to establish a definitive diagnosis of myocarditis, especially since this disorder has been treated with immunosuppressive therapy. Recent diagnostic criteria (the "Dallas Classification") are reviewed, and pitfalls and limitations are discussed.

Diagnosis of myocarditis by endomyocardial biopsy.