Pathogenic variants in MT-ATP6: A United Kingdom–based mitochondrial disease cohort study by Ng, YS, Martikainen, MH, Gorman, GS, Blain, A, Bugiardini, E, Bunting, A, Schaefer, AM, Alston, CL, Blakely, EL, Sharma, S, Hughes, I, Lim, A, Degoede, C, McEntagart, M, Spinty, S, Horrocks, I, Roberts, M, Woodward, CE, Chinnery, PF, Horvath, R, Nesbitt, V, Fratter, C, Poulton, J, Hanna, MG, Pitceathly, RDS, Taylor, RW, Turnbull, DM, McFarland, R