Should a doctor cry in front of a patient?

Faced with a heartbreaking situation, is it a doctor's duty to maintain their composure and adopt a stiff upper lip? 

Or should they allow their human feelings to show and not be embarrassed if the tears flow?

This is the question posed by Dr Mark Warren, a psychiatrist at the Mayo Clinic in the US after he found himself in tears when discussing the poor prognosis of a rhabdomyosarcoma with a preteen boy and his family.

Writing in