title: Bias and random error in retinol measurements of laboratories in countries with populations with mild to severe vitamin A deficiency.
authors.affiliation: Division of Human Nutrition and Epidemiology, Wageningen University, PO Box 8129, 6700 EV Wageningen, The Netherlands. paul.hulshof@staff.nutepi.wau.nl
authors.forename: Paul J M
authors.initials: PJ
authors.lastname: Hulshof
authors.forename: Jitske T
authors.initials: JT
authors.lastname: Brouwer
authors.forename: Jan
authors.initials: J
authors.lastname: Burema
authors.forename: Clive E
authors.initials: CE
authors.lastname: West
mesh_terms: 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*
chemical_list: D014801:Vitamin A