21. They convened, in San Francisco, at an American Society of Hematology conference. 22. American Society of Hematology : http : / / www . hematology . org/ 23. American Society of Hematology : http : / / www . hematology . org/ 24. Bulgaria is in the process of reforming its system of 28 regional hematology centers. 25. With these discoveries, hematology , a new field of medicine, was established. 26. Hirschfeld was the author of many publications in the fields of hematology and histology. 27. He is board certified in both hematology and internal medicine and remains clinically active. 28. Among his research interests were hematology and nutrition. 29. He trained in pediatrics and hematology at Children's Hospital Medical center in Boston. 30. Leslie Laufman, M . D ., Hematology Oncology Consultants, Columbus, Ohio.
