Ceremonial Behavior; Clothing/history; General Surgery/history; Gloves, Surgical/history; Hygiene/history; Patients; Physicians/history; Sterilization/history; Surgical Procedures, Operative; Symbolism; Attitude of Health Personnel; Clothing/psychology; Clothing/standards; Europe; History, 19th Century; History, 20th Century; History, 21st Century; Hospitals; Humans; Hygiene/standards; Patients/psychology; Physicians/psychology; Physicians/standards; Physicians/statistics & numerical data; Physicians/trends; Protective Clothing/history; Textiles/history; United States