Assessment of sociodemographic and anthropometric data and of quality of life
Sociodemographic data was collected at baseline through a standardized questionnaire. Anthropometrics (e.g. body weight, height, and composition) were objectively measured at all three study visits by the study team. Body height was measured to the nearest cm by using a stadiometer (SECA 214, Seca GmbH & Co., KG, Germany) and body weight and body composition was measured in light clothing, with an empty bladder, and without shoes by a bioimpedance analysis scale (BC-418MA, Tanita Europe B. V., Netherlands). The BMI has been calculated as body weight (in kg) divided by the square of body height (in m).Health-related quality of life was assessed at all three study visits through the validated 