Reproducibility and validity of a food frequency questionnaire among pregnant women in a mediterranean area

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• who: Mediterranean area et al. from the Nonfasting blood samples were obtained from each participant during the first visit between weeks, th of pregnancy and analysed in a central laboratory (Queen's University, Belfast)All participants were instructed by the interviewers not to consume fruits, vegetables or juice for breakfast on the day of the blood test. A thorough protocol was designed to collect, transport and measure the blood samples for vitamin C, E, folate and carotenoids. Blood samples were separated by centrifugation and stored at, °C. The blood samples for vitamin C determination were collected at . . .
  

   

  

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