Evaluating 'Power 4 a Healthy Pregnancy' (P4HP) - protocol for a cluster randomized controlled trial and process evaluation to empower pregnant women towards improved diet quality. - van Lonkhuijzen, R. M. Renske; Cremers, S. Susanne; de Vries, J. H. M. Jeanne; Feskens, E. J. M. Edith; Wagemakers, M. A. E. Annemarie; van Lonkhuijzen, Renske M; Cremers, Susanne; de Vries, Jeanne H M; Feskens, Edith J M; Wagemakers, Annemarie (BMC Public Health, 2022)