Maternal vitamin nutrition and malformations of the neural tube.

I N T R O D U C T I O N . N U T R I T I O N A L D E F I C I E N C Y A N D N T D . . ANIMAL S T U D I E S . STUDIES I N MAN . P E R I C O N C E P T I O N A L V I T A M I N I N T A K E A N D NTD . . MULTI-VITAMIN I N T E R V E N T I O N S T U D I E S . . RETROSPECTIVE S T U D I E S OF VITAMIN I N T A K E . . P E R I C O N C E P T I O N A L VITAMIN INTERVENTION S T U D I E S I N PROGRESS . M I C R O N U T R I E N T M E T A B O L I S M A N D N T D . . C O N C L U S I O N S . R E F E R E N C E S . . 33 34 34 35 36 36 40 41 42 44 45