OWN - Quintessence Publishing Company, Ltd. CI - Copyright Quintessence Publishing Company, Ltd. OCI - Copyright Quintessence Publishing Company, Ltd. TA - Endodontie JT - Endodontie IS - 0940-9505 (Print) IP - 3 VI - 29 PST - ppublish DP - 2020 PG - 235-236 LA - de TI - Wer ist denn nun systemrelevant? FAU - Schäfer, Edgar AU - Schäfer E CN - AB - AID - 836724