My daughter had upper abdominal pain. After seeing many doctors in the ER and 2 G.I. specialists, having my daughters gallbladder removed, endoscopy, HIDA scan, testing testing and more testing. We finally met Dr. Sandler, immediately he knew what to do, he knew what she had wrong with her. Thank God for him. After 6 months of pain and nausea, he figured out her problem. He relieved her pain. I’d give way more stars if I could.