1 Department of Hematology, Internal Medicine Division, Dr. Jose Eleuterio González University Hospital and School of Medicine, Universidad Autonoma de Nuevo León, Monterrey, Mexico. Electronic address: carjaime@hotmail.com.
2 Department of Hematology, Internal Medicine Division, Dr. Jose Eleuterio González University Hospital and School of Medicine, Universidad Autonoma de Nuevo León, Monterrey, Mexico.