1 Department of Genetics, Federal University of Pernambuco, Recife, Brazil; Department of Hematology, Cancer Research Centre Groningen, University Medical Centre Groningen, University of Groningen, Groningen, Netherlands.
2 Department of Hematology, Cancer Research Centre Groningen, University Medical Centre Groningen, University of Groningen, Groningen, Netherlands.
3 Department of Genetics, Federal University of Pernambuco, Recife, Brazil.
4 Hematology Division, LIM31, Faculdade de Medicina, University of São Paulo, São Paulo, Brazil.
5 Department of Genetics, Federal University of Pernambuco, Recife, Brazil. Electronic address: antonio.araujo@ufpe.br.