The first edition of Circulation : Arrhythmia and Electrophysiology appeared in April 2008 , followed by an edition dedicated to heart failure in May titled Circulation : Heart Failure .
2008 saw the appearance of six subspecialty journals .
The first edition of Circulation : Arrhythmia and Electrophysiology appeared in April 2008 , followed by an edition dedicated to heart failure in May titled Circulation : Heart Failure .
2008 saw the appearance of six subspecialty journals .