Reid-McCann, R J, Brennan, S F, McKinley, M C & McEvoy, C T 2022, ' The effect of animal versus plant protein on muscle mass, muscle strength, physical performance and sarcopenia in adults: protocol for a systematic review ', Systematic Reviews, vol. 11, no. 1, 64, pp. 64 . https://doi.org/10.1186/s13643-022-01951-2