1. 1) Park JS, Oh DH, Hwang NK, et al.: Effects of neuromuscular electrical stimulation combined with effortful swallowing on post-stroke oropharyngeal dysphagia: a randomised controlled trial. J Oral Rehabil, 2016, 43: 426–434.
2. 2) Kim HD, Choi JB, Yoo SJ, et al.: Tongue-to-palate resistance training improves tongue strength and oropharyngeal swallowing function in subacute stroke survivors with dysphagia. J Oral Rehabil, 2017, 44: 59–64.
3. 3) Park JS, Hwang NK, Oh DH, et al.: Effect of head lift exercise on kinematic motion of the hyolaryngeal complex and aspiration in patients with dysphagic stroke. J Oral Rehabil, 2017, 44: 385–391.
4. 4) Clark HM, Shelton N: Training effects of the effortful swallow under three exercise conditions. Dysphagia, 2014, 29: 553–563.
5. 5) Jang HJ, Leigh JH, Seo HG, et al.: Effortful swallow enhances vertical hyolaryngeal movement and prolongs duration after maximal excursion. J Oral Rehabil, 2015, 42: 765–773.