Given an abstract of a paper, generate a title for this paper such that conveys the key focus of the paper.
Q: 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.
A:
Diagnosis of myocarditis by endomyocardial biopsy.