it was originally conceived in 1996 as an emergency medicine textbook but its content has expanded a lot since then to include allergy and immunology, cardiology, clinical procedures, critical care, dermatology, emergency medicine, endocrinology, gastroenterology. genomic medicine, hematology, infectious diseases, nephrology, neurology, obstetrics/gynecology, oncology, pathology, perioperative care, physical medicine and rehabilitation, psychiatry, pulmonology, radiology, rheumatology, and sports medicine. surgical subspecialties include neurosurgery, ophthalmology, orthopedic surgery, (ent) and facial plastic surgery, plastic surgery, thoracic surgery, transplantation, trauma, urology, and vascular surgery.