The number of people who were blessed, as of now, is 12.
I can only say that it is the result of their faith and meticulous following of the procedures.
The ultimate prayer one must follow is that wants nothing in return.
This is what is most useful for what we need keeps on changing and the more one gets,sadder he becomes later because of what he asked for.
So God knows what is good for you and you need not ask for it for a mother knows what is needed for the child.