https://www.slideshare.net/BTGCorp/pengaruh-golongan-darah-pada-tingkat-risiko-covid19-idnmedis-dr-hadian-widyatmojo-sppk
https://www.slideshare.net/BTGCorp/covid19-pada-ibu-hamil-dan-menyusui-idnmedis-dr-jessica-s-raditia-mdch-rpsgt