This book presents the latest developments in medicine and biology. Chapters include research on environmental risk factors for diabetic nephropathy; pre-endoscopic management of patients with hematemesis; the benefits of early diagnosis, halo fixation and/or ventral stabilization of dens-fractures in correspondence to age of the patient and fracture type; a discussion on how and to which extent heart rate variability (HRV) is acutely changed in diabetic ketoacidosis (DKA) or in hyperglycemic hyperosmolar syndrome (HHS); an evaluation of the anatomical, refractive and functional results of an innovative technique of deep anterior lamellar keratoplasty; the physical, emotional and quality of life aspects of patients with Cervical Dystonia; the current issues in medical literature regarding androgen use during menopause; an overall report on the benefits and limitations of human milk oligosaccharides (HMOs) mass spectrometry (MS) analysis; the classification methods of the X-ray cerebral angiograms; and the diagnosis and management of intraoperatively necrotizing fasciitis of the breast.