Traveling abroad for health is not a new phenomenon.In ancient Greece, pilgrims and patients came from all over the Mediterranean to the sanctuary of the healing god, asklepios; the god of healing was located at Epidaurus. In roman Britain, patients took the waters at a shrine at bath, a practice that continued for 2,000 years. During 18th century wealthy Europeans used to visit health resorts in North Africa. But in the past seven years or so, the movement has accelerated sharply. Cross-border travel for health reasons is a $40 billon market and growing at over 15% a year throws up huge...