easySLM-STED: stimulated emission depletion microscopy with aberration correction, extended field of view and multiple beam scanning - Gorlitz, F; Guldbrand, S; Runcorn, T; Murray, R; Jaso-Tamame, A; Sinclair, H; Martinez-Perez, E; Taylor, J; Neil, M; Dunsby, CW; French, P (Journal of Biophotonics, 2018)