Darejeh and Singh (2014) concluded that self-learning is improved by taking ____ differences into account

Which type of epidemiological study played an important role in initially identifying the risk factors that led to AIDS?

A) a retrospective study B) a prospective study C) a randomized clinical trial D) a meta-analysi

What is a common symptom of gonorrhea in men?

a. Itching of the scrotal region b. Painful erections c. An inability to ejaculate d. Painful or frequent urination