Sitting in a college library on Labor Day 2009, Deanna Rennon tried to ignore the guilt she felt about spending the holiday at Mary Washington University instead of boating with her family as her husband, Doug, had planned. Before she plunged into research for a psychology paper, Rennon, who was working 20 hours a week and carrying a full load of undergraduate courses, decided to spend a few minutes online searching for the subject that had become a preoccupation: the neurological disorder affecting the youngest of her four children, Erica, who was nearly three. "At that point I was just grasping at straws," recalled Rennon, now 39. She clicked on a 2007 article in a paediatric...
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