Kaewsri, Amornrat, Onuma Boonyarom, and Kanokwan Srisupornkornkool. 2021. “Comparing effects of Nordic hamstring exercise in combination with electrical stimulation and in combination with the FIFA 11+ program on footballers with strained hamstring muscles”. Chulalongkorn Medical Journal 65 (4). Bangkok, Thailand. https://he05.tci-thaijo.org/index.php/CMJ/article/view/1083.