A new quality or mere co-occurence?

Normalizing the list of diagnoses, I’ve removed the “TGA+VSD” entry, changing the representation into two separate diagnoses, “TGA” and “VSD”. If you don’t know anything about the medicine, it seems perfectly fine. But if you do, you’ll know that the “TGA+VSD” is not a mere co-occurence, it’s a very different case from both TGA and VSD, although both TGA and VSD defects are present.

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