The investigators, led by Dr Katherine Chretien of the Washington DC VA Medical Center, said medical students may not be aware of how online posting can reflect negatively on medical professionalism or jeopardise their careers.

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In the evening, the Vice President and Dr. Biden will depart London, United Kingdom, en route Washington, DC.

WHITEHOUSE: President's Schedule

But Dr Franco Lori from the Research Institute for Genetic and Human Therapy in Washington DC has been investigating whether interruptions in treatment might actually boost the immune system.

BBC: Treatment 'holidays' may stall HIV