Steinemann N., Grize L., Ziesemer K., Kauf P., Probst-Hensch N., and Brombach C. “Relative Validation of a Food Frequency Questionnaire to Estimate Food Intake in an Adult Population”. Food & Nutrition Research, vol. 61, Mar. 2017, https://foodandnutritionresearch.net/index.php/fnr/article/view/1165.