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Rationale and design of the B-PROOF study, a randomized controlled trial on the effect of supplemental intake of vitamin B12 and folic acid on fracture incidence

Janneke P van Wijngaarden*, Rosalie AM Dhonukshe-Rutten, Natasja M van Schoor, Nathalie van der Velde, Karin MA Swart, Anke W Enneman, Suzanne C van Dijk, Elske M Brouwer-Brolsma, M Carola Zillikens, Joyce BJ van Meurs, Johannes Brug, André G Uitterlinden, Paul Lips and Lisette CPGM de Groot

BMC Geriatrics 2011, 11:80  doi:10.1186/1471-2318-11-80

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