Simultaneous positron emission tomography/magnetic resonance imaging identifies sustained regional abnormalities in cardiac metabolism and function in stress-induced transient midventricular ballooning syndrome: a variant of takotsubo cardiomyopathy. - Ibrahim T; Nekolla SG; Langwieser N; Rischpler C; Groha P; Laugwitz KL; Schwaiger M (Circulation, 2012)