1.
Preston AM, Palacios C, Rodríguez CA, Vélez-Rodríguez RM. Validation and Reproducibility of a Semi-Quantitative Food Frequency Questionnaire for Use in Puerto Rican Children. PRHSJ [Internet]. 2011 May 16 [cited 2026 Jan. 15];30(2). Available from: https://prhsj.rcm.upr.edu/index.php/prhsj/article/view/521