espina bífida National Institute of Neurological Disorders and Stroke NIH Spina bifida National Institute of Neurological Disorders and Stroke National Institute of Neurological Disorders and Stroke National Institutes of Health range of symptoms four in every 10,000 people inglÃ©s range of symptoms National Institute of Neurological Disorders and Stroke National Institute of Neurological Disorders and Stroke National Institute of Neurological Disorders and Stroke Hoja informativa sobre la espina bífida treatment of spina bifida most likely 1,500 and 2,000 1,500 and 2,000 1,500 to 2,000 spina bifida 1,500 to 2,000 spina bifida National Institutes of Health Spina Bifida Fact Sheet Spina bifida spina bifida neural tube defects most likely