Hubungan antara tingkat kesadaran dan pengetahuan terhadap status periodontal pasien periodontitis dan diabetes melitus: studi pada masa pandemi COVID-19 di Klinik Periodonsia RSKGM FKG UI = The relationship between level of awareness and knowledge on periodontal status of periodontitis patients with diabetes mellitus: study during COVID-19 pandemic in Dental Hospital of Universitas Indonesia