I found out I had high calcium levels in my blood. I wanted to find the best doctor and was referred to Dr. Yeh. I had an operation that would help prevent osteoporosis or osteopenia. It was quick and simple. The operation itself only took 20 -30 minutes although with prep time I was there for 6 hours or so. There was a short down period after the surgery but the results were fast. Dr. Yeh is a very nice gentleman and very accomplished.