Mihali, Klevis, Birgit Markus, Bernhard Schieffer, Marcus Bauer, and Julian Kreutz. 2025. “Thinking Outside the Box: Case Report of a Rare Quadricuspid Aortic Valve As an Underrecognized Cause of Heart Failure and Atrial Fibrillation”. Journal of Medical Cases 16 (8): 277-81. https://doi.org/10.14740/jmc5153.