For example, a distal protection system for coronary-artery interventions received a CE mark after a single-group study involving 22 subjects showed that the device worked as intended. In the United States, FDA approval came several years later on the basis of a randomized study involving 800 subjects, in which a clinical end point of major adverse cardiac events was used.
Un estudio con 22 personas frente a otro con 800 para aprobar el mismo producto... Muy llamativo, ¿no?