AUTHOR=Al-Osta Ibrahim , Mucha Mariusz , Pereda Daniel , Piqué-Gili Marta , Okorocha Albert E. , Thomas Roisin , Hartell Nicholas A. TITLE=Corrigendum: Imaging Calcium in Hippocampal Presynaptic Terminals With a Ratiometric Calcium Sensor in a Novel Transgenic Mouse JOURNAL=Frontiers in Cellular Neuroscience VOLUME=13 YEAR=2019 URL=https://www.frontiersin.org/journals/cellular-neuroscience/articles/10.3389/fncel.2019.00194 DOI=10.3389/fncel.2019.00194 ISSN=1662-5102