In the article, “Use of [13C]Bicarbonate for Metabolic Studies in Preterm Infants: Intragastric versus Intravenous administration,” by Maaike A. Riedijk, et al., Pediatric Research 2005; 58:861–864, the equation on page 862 should read:

Estimated body CO2 production = [(IE infusate/IE breath)-1] × tracer infusion rate × 1000