Dr. Rakesh Parekh was in his mid-40s when he first noticed something was wrong: During his workouts, his left arm was weaker and struggled to keep up. Initially, Parekh, an emergency medicine doctor and father of three, assumed he was overdoing it in the gym. “There was no part of me that wanted to believe that was in jeopardy,” said Parekh, 52, of Orlando, Florida. Parekh had watched his father die of amyotrophic lateral sclerosis, the progressive neurological disease commonl

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