/ 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.
ColorBlind Images/Blend Images/Getty Images. Internal medicine is devoted to internal diseases that occur in adults and, in some cases, adolescents. A doctor who specializes in internal medicine is called an internist and is trained in primary care. Internists are experts in diagnosis, treat chronic illnesses, promote health through strategies such as wellness education and try to prevent disease. In addition to general internal medicine, many subspecialties exist.