Methods: Participants answered two questionnaires, a detailed study-specific questionnaire focusing on the incident of various infections and disease symptoms, and a health related quality of life Short-Form 36 v 2 (SF-36 v 2) questionnaire.
Aðferð: Þátttakendur í rannsókninni svöruðu tveimur spurningalistum; ítarlegum heilsufarsmiðuðum spurningalista og Short-Formv 2 (SF-36 v 2) spurningalista um heilsutengd lífsgæði (HL).