Apologies - I didn't catch that the HF / healthy patients are from two different datasets. Agreed that this essentially invalidates the result. The missing exp

Apologies - I didn't catch that the HF / healthy patients are from two different datasets. Agreed that this essentially invalidates the result. The missing experiment is to have a third dataset from yet another machine, with both positive/negative examples, and use it as the test dataset. Then transferability questions are at least somewhat addressed.