Even if we may not know this concept exactly by name, the overall sentiment around practicing physicians is that the individual aspects of this concept does make a difference. Some patients just fare better because they have better genes (think about the guy who's been smoking for his entire life and doesn't have lung cancer vs the healthy vegan with metastatic lung cancer). It's also widely accepted that patients who are depressed have poorer outcomes in terms of recovering from illness. Finally, having a strong social network is known to help with the recovery process. One of the big things they check before allowing patients to get organ transplants is that there's a strong social network to help the patient recover.