Medicine, Studies, MORTALITY, Research, Epidemiology, Medical research, Skin, Dentistry, Confidence intervals, Skin - pathology, Clinical medicine, Mouth Diseases - pathology, Complement C3 - analysis, Pemphigus - pathology, Mouth Diseases - immunology, Mouth Mucosa - pathology, Mouth Diseases - diagnosis, Epithelium - immunology, Pemphigus - immunology, Epi...