Every year millions of students go away to college. Some continue under their parents health insurance plan. Some (1.7 million) go without, and others buy coverage offered by their university.Ziqu Liu was one of those students who purchased a health plan through his university. In January he was diagnosed with osteosarcoma. Right now he is focused on treating the disease.But his treatment in Columbus carries a steep price. The lowest estimate for the cost of his care, which includes two...