For which anatomic area is ultrasonography ineffective?

At which of the following times should you wash your hands?

A) Before meals B) When your hands are visibly soiled C) After every patient contact and/or decontamination procedure D) All of the above

Psychological readiness for toilet training generally occurs at age ________ months

A) 12 to 15 B) 15 to 24 C) 18 to 30 D) 24 to 36