/ 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.
Medicine 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.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.