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Stéphanie Vandentorren*, Corinne Bois, Claudine Pirus, Hélène Sarter, Georges Salines, Henri Leridon and the Elfe team
* Corresponding author: Stéphanie Vandentorren s.vandentorren@invs.sante.fr
BMC Pediatrics 2009, 9:58 doi:10.1186/1471-2431-9-58