11.   A medical doctor and engineer, Thagard reported on several occasions after his mid-March liftoff that he felt isolated.

12.   A medical doctor sometimes needs to perform physical examinations.

13.   A medical doctor studies for many years and interns for an additional period of time prior to beginning a viable practice.

14.   A no-nonsense medical doctor who once believed there was a scientific explanation behind every X-file.

15.   After seeing a marriage counselor and a sex therapist, Christopher went to a medical doctor to see if there was a physical reason for his problems.

16.   Bright and energetic, Chelsea chose Stanford over East Coast schools as she pursues her dream to become a medical doctor.

17.   Build a better mouse and the world will beat a path to your door, believes Johan Ullman, a Swedish medical doctor and ergonomics expert.

18.   But Simelela is also a medical doctor.

19.   Dr. Barbara Rommer, a medical doctor from Fort Lauderdale, has heard such stories, she says.

20.   Dr. Barbara Rommer, a medical doctor from Fort Lauderdale, Fla. has heard such stories, she says.