 A validated sun exposure questionnaire evaluating amongst other things time spent outdoors withwithout sun protection, body parts exposed to sun and travel in sunny areas; will be filled in with the help of a trained interviewer. Subsequently, the rule of nines will be used to calculate skin sun exposure. This number will be multiplied by the reported average sun exposure per week without sunscreen to calculate the sun exposure index. The subjects most recent dual x-ray absorptiometry results will be recorded. 