Liam McNicholas, 12, of Lindenhurst, talks with Meghan Kostyk, an advanced practice nurse, on Feb. 9, 2017, during his biannual visit to Lurie Children’s Hospital for a checkup. Liam has Duchenne muscular dystrophy, a condition which is treated by a drug from a Northbrook company that just received FDA approval. (Alyssa Pointer / Chicago Tribune)...