and it's not a small travel (e.g. the British tourists that went on board the Diamond Princess). If you are not in good health at the beginning, you don't adve

and it's not a small travel (e.g. the British tourists that went on board the Diamond Princess). If you are not in good health at the beginning, you don't adventure yourself 10 hours+ from your home. So this group is likely in better shape than average population.