Overwhelmingly, medical students saw the decision to become a doctor as a byproduct of something other than just financial compensation or the prestige of medicine. Although an interest in the subject matter certainly helped steer them, our respondents expressed a desire to help others and felt a "call" toward medicine that extended beyond other career concerns. Of note, compared with women, men were nearly twice as likely to consider financial compensation as a factor and felt more influenced by both the prestige inherent to the career and having other physicians in the family. Source
This should help: http://asrjetsjournal.org/index.php/American_Scientific_Journal/article/view/1663/761