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When Liz Jurcik of Seattle felt a sharp pain in her side and back in January of 2013, she didn't think much about it.

Jurcik, a 31-year-old human resources professional at Boeing, ran regularly and was in good shape. She thought it was probably a strained muscle from a workout. But the pain got worse, and by early February she could barely stand up. "I had the absolutely worst pain in my life," she said. "I couldn't stand up straight."