walaikumusalam shaista
just like canadian family told u , u may go to pims in islamabad or if is it possible for u u may visit at agha khan hospital karachi and meet dr salman adil he is the derpartment head of hemotology and he is one of the finest doctor in country or meet dr tahir shamsi at nibd (national institute of blood disease and bone marrow transplantation) he is also very good
best regards
adeel