Janice Pruitt and her parents, J.C. and Louise VanBuskirk, often sit for hours as they work on assembling 1,000-piece puzzles. Once a month, Pruitt, 45, goes to OU Physicians in Oklahoma City for intravenous gamma-globulin infusions, often referred to as IGG.

The puzzles keep her occupied during the treatment.

She takes time away from her family and her work as a dietitian at a dialysis center to sit quietly ...