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abbott
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 good point! in addition,the placebo effect will always be potentially present since the patient is totally aware that he s undergoing a device by percutaneous approach.the patient knows perfectly well what is happening. impossible to be as a blind study . so,bias can be present
Cardiac Surgery/ President of the Examination Board for Judiciary Experts at the Mexican College of Cardiovasc & Thorac Surgery/ National Academy ofMedicine Mex