If your country doesn't have a medical system that will detect such things in the general population and does not have a system to get the numbers for statistic

If your country doesn't have a medical system that will detect such things in the general population and does not have a system to get the numbers for statistics, how are you going to know how prevalent something is? We don't know how common lots of things are in 1st world countries either, simply because we don't track.