Saad MC, Vasconcelos RA, Mancinelli LVO, Munno MSB, Liporaci RF, Grossi DB. Is hip strengthening the best treatment option for females with patellofemoral pain? A randomized controlled trial of three different types of exercises. Braz J Phys Ther. 2018 Sep-Oct;22(5):408-416. doi: 10.1016/j.bjpt.2018.03.009. Epub 2018 Apr 4. PMID: 29661570; PMCID: PMC6157473.