During the Twentieth Century, a Nurse Participated in Research That

Multiple Choice

During the twentieth century, a nurse participated in research that examined the epidemiology of various diseases. Which of the following best describes the factors that influenced these studies? (Select all that apply.)

A) Increasing rate of poverty
B) Declining child mortality rates
C) Overcrowding in major cities
D) Development of new vaccinations
E) Advancements in medical equipment