A healthy 15-year-old boy with a two-week history of a persistent, productive cough.

A 45-year-old woman with sudden-onset epigastric pain, nausea, and vomiting.

A 77-year-old woman with right-sided abdominal pain.

A 38-year-old woman immediately postoperative with shortness of breath.

A 19-year-old man with shortness of breath and a sore throat.

A 52-year-old man with increasing abdominal pain.