/ Design Patterns. In software engineering, creational design patterns are design patterns that deal with object creation mechanisms, trying to create objects in a manner suitable to the situation. The basic form of object creation could result in design problems or added complexity to the design.
1 Gastroenterologist-specializes in diseases of the digestive system. 2  Geriatrician (Geriatric Medicine) - general practice physician who specializes in caring for older adults. 3  Hematologist-a hematologist specializes in diseases of the blood and bone marrow. 4  Hepatologist-specializes in diseases of the liver.
What Hematologists Do. Although hematology is the study of human blood in both health and disease, hematologists usually focus on the disease-related aspects. Blood disorders and disease could include problems with red or white blood cells, the blood vessels, bone marrow, lymph nodes or spleen.edicine is a field with many specialties, one of which is hematology. Hematologists are specialists in diseases and other problems related to the blood. Some hematologists specialize in blood cancers and are called hematologist-oncologists.