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Self efficacy for fruit, vegetable and water intakes: Expanded and abbreviated scales from item response modeling analyses

Tom Baranowski*, Kathleen B Watson, Christine Bachman, Janice C Baranowski, Karen W Cullen, Debbe Thompson and Anna-Maria Siega Riz

International Journal of Behavioral Nutrition and Physical Activity 2010, 7:25  doi:10.1186/1479-5868-7-25