Eric Walker added 2019-07 Baylor College of Medicine study on non-prescription use of antibiotics in the United States, 2019-12 Harvard Medical School study on antibiotic exposure among children younger than five and 2019-12 Oregon State University study on the overprescribing of antibiotics in ambulatory care and a number of links to Antibiotic resistance and use of antibiotics in humans, and added Antibiotic resistance and use of antibiotics in humans to Human physiology and Antibiotic resistance (ABR)