次の英文の下線部を和訳せよ。
For something so widely desired, happiness has not received much attention from doctors. One reason is the difficulty of measuring the amount of happiness: it is a condition that is identified and defined not by the doctor but by the patient. Another is the mediacal community's tendency to study illness, not good health. Most research has been focused on curing illnesses.
――福岡大学 (2月11日実施)――2004年