She says it has been a difficult decision, but it has been taken with the full support of the medical staff and after psychologicaltesting and counselling from experts at Guy's Hospital, London.
For those of you who have ever taken any psychological profiling or testing for work, you have probably run across the Myers-Briggs test (called MBTI).
They interviewed the participants three times between 2002 and 2011, assessing them using three measures of psychological well-being and testing their enjoyment of life with a series of questions.