[1] Univ Porto, Inst Publ Hlth, EPIUnit, P-4100 Oporto, Portugal
[2] Ctr Hosp Sao Joao, Integrated Pediat Hosp, Div Pediat Nephrol, Oporto, Portugal
[3] Univ Porto, Fac Med, Dept Pediat, P-4100 Oporto, Portugal
[4] Ctr Hosp Sao Joao, Integrated Pediat Hosp, Div Pediat Cardiol, Oporto, Portugal
[5] Univ Porto, Fac Med, Dept Clin Epidemiol Predict Med & Publ Hlth, P-4100 Oporto, Portugal
[6] Ctr Hosp Sao Joao, Integrated Pediat Hosp, Div Pediat Nutr, Oporto, Portugal
[7] Heidelberg Univ, Ctr Pediat & Adolescent Med, Div Pediat Nephrol, Heidelberg, Germany