Statistics are always interpretable, ask any statistician or...

Statistics are always interpretable, ask any statistician or politician.
We can look at it that there are 'currently' about 140m babies born per year world wide.
About 105% are male, so if we take approx numbers of 75m / 3600 (DMD babies ratio 3600:1) =21000 approx.
Average life of DMD boys is approx 20.
20x21000=420000
At any given time its possible there could be approx 400k DMD boys worldwide .

ANP's estimate seems valid.
Also, that would be a 126 with many zeroes at total exposure of market.

If my figures are out, please forgive me