Positive linear relationship between BMI and (A) postero-anterior (PA) spine, (B) total hip and (C) femoral neck bone mineral density (BMD) Z-scores, as well as appendicular lean mass and (D) PA spine, (E) total hip and (F) femoral neck BMD Z-scores, in men with anorexia nervosa, avoidant/ restrictive food intake disorder, atypical anorexia nervosa and healthy controls