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418 CHAPTER 20 30. Mijnarends DM, Schols JMGA, Meijers JMM, et al. Instruments to assess sarco - penia and physical frailty in older people living in a community (care) setting: sim - ilarities and discrepancies. J Am Med Dir Assoc . 2015;16(4):301-308. doi:10.1016/j. jamda.2014.11.011 31. Pel-Littel RE, Schuurmans MJ, Em - melot-Vonk MH, Verhaar HJJ. Frailty: De - fining and measuring of a concept. JNHA - J Nutr Heal Aging . 2009;13(4):390-394. doi:10.1007/s12603-009-0051-8 32. Rockwood K, Stadnyk K, MacKnight C, McDowell I, Hebert R, Hogan DB. A brief clinical instrument to classify frailty in elderly people. Lancet (London, England) . 1999;353(9148):205-206. doi:10.1016/ S0140-6736(98)04402-X 33. Chargi N, Ansari E, Huiskamp LFJ, Bol G, de Bree R. Agreement between skeletal muscle mass measurements using com- puted tomography imaging and magnetic resonance imaging in head and neck cancer patients. Oral Oncol . 2019;99. doi:10.1016/j. oraloncology.2019.06.022 34. Bril SI, Wendrich AW, Swartz JE, et al. In - terobserver agreement of skeletal muscle mass measurement on head and neck CT imaging at the level of the third cervi- cal vertebra. Eur Arch Otorhinolaryngol . 2019;276(4):1175-1182. doi:10.1007/s00405- 019-05307-w

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