Antibacterial activity of combined extracts of red ginger (Zingiber officinale var. Rubrum) and betel leaf (Piper betle L.) against Staphylococcus aureus and Escherichia coli - Pramiastuti, Oktariani (Department of D3 Medical Technology Laboratory STIKes Hutama Abdi Husada Tulungagung, 2020)