Bias and random error in retinol measurements of laboratories in countries with populations with mild to severe vitamin A deficiency.
Hulshof
Paul J M
PJ
Division of Human Nutrition and Epidemiology, Wageningen University, PO Box 8129, 6700 EV Wageningen, The Netherlands. paul.hulshof@staff.nutepi.wau.nl
Brouwer
Jitske T
JT
Burema
Jan
J
West
Clive E
CE
D000349:Africa; D015982:Bias; D019963:Clinical Chemistry Tests / Q000592:standards; D006801:Humans; D011786:Quality Control; D014801:Vitamin A / Q000097:blood*; D014802:Vitamin A Deficiency / Q000097:blood*
D014801:Vitamin A