A thought ~ the technology is now so good, and the skills of the physicians so finely honed, maybe any difference in recovery prayer might provide is simply too small to measure.
Thanks for jogging my memory. All I could recall was that it had to do with the heart.
I do believe it helps if a patient is receptive to prayers. Years ago, I read of a priest hospitalized with severe heart problems. He asked for a photo of a healthy heart and began to pray. Some days later, another x-ray revealed that his heart had healed.