51.   Doctors believe the disease is concentrated among prisoners because of their high rate of intravenous drug use before being incarcerated.

52.   Doctors long believed the disease occurred only during middle age or later.

53.   Doctors now believe the lesions likely caused the headache.

54.   Doctors believe he was probably born Monday, Re said.

55.   Doctors believe it is caused by a malfunction of the immune system and typically treat children with anti-inflammatory drugs starting with ibuprofen and moving to more potent drugs.

56.   Doctors believe it likely resulted from his many years spent on sun-soaked beaches.

57.   Doctors believe it protects the skin in utero and lubricates the baby for the journey down the birth canal.

58.   Doctors believe the extra time will further stabilize the knee and facilitate recovery.

59.   Doctors believe the Hall of Famer contracted hepatitis from blood transfusions he received during earlier treatments for athletic injuries.

60.   Doctors believe there is a disk fragment floating around in his back.