High incidence of low vitamin B12 levels in Estonian newborns
Keywords: پروپیونیل کارنیتین; Newborn screening; Tandem mass spectrometry; Congenital vitamin B12 deficiency; Elevated propionylcarnitine; NBS; newborn screening; MMA; methylmalonic acid; tHcy; total homocysteine; MS; mass spectrometry; DBS; dried blood spots; C3; propionylcarnitine;