The major of internal medicine is divided into disciplines. According to public information, there are many disciplines for training, including internal medicine, surgery, neurology, orthopedics, urology, cardiac surgery, neurosurgery, obstetrics and gynecology, pediatrics, general practice, dermatology, plastic surgery, pathology, ultrasound, radiology and so on. Internal medicine includes: cardiovascular medicine, gastroenterology, endocrinology, nephrology and respiratory medicine.