Corrigendum: Toward an Energy Efficient Wastewater Treatment: Combining a Microbial Fuel Cell/Electrolysis Cell Anode With an Anaerobic Membrane Bioreactor - Kocatürk-Schumacher, Nazli Pelin; Madjarov, Joana; Viwatthanasittiphong, Pavaris; Kerzenmacher, Sven (Frontiers in Energy Research, 2019)