Analisis Praktik Ners Spesialis Keperawatan Medikal Bedah Peminatan Neurologi Dengan Kasus Utama Lumbal Spinal Canal Stenosis di Rumah Sakit Pusat Otak Nasional Prof. Dr. dr. Mahar Mardjono Jakarta = Practical Analysis Nurse Practitioner Residency of Medical Surgical Nursing Specialist in Neurological System Disorder Patient with The Main Case Lumbal Spinal Canal Stenosis Using Roy’s Adaptation Model Approach in National Brain Centre Hospital Prof. DR