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children study method energy expenditure energy sample urine saliva equation body composition measurement water outcome palsy analysis expenditure reference saliva samples intake skinfold composition bioelectrical impedance analysis child isotope table energy intake disability result body water population impedance reference method skinfold measurements sampling correlation netherland thickness measure bioelectrical enrichment deuterium weight ficient impairment nutrition scho field equation difference agreement mass spectrom z-score model length urine samples anthropometric neurol tibia length motor rotterdam aicardi syndrome rieken isotope dilution author erasmus universiteit rotterdam assessment dilution subject growth skinfold thickness quality european e-journal state tibia oxygen correlation coef ficients collection 2009 john wiley saliva sampling movement value syndrome