Efek preventif pemberian ekstrak etanol 70% rumput mutiara (hedyotis corymbosa (L.) Lamk.) terhadap perubahan proteoglikan pada sendi tikus model osteoartritis = Preventive effect of 70% ethanolic extract of pearl grass (hedyotis corymbosa(L.) Llamk.) on proteoglycan changes in joint of osteoarthrtis rats model / Natasya Linsie Corona Datunsolang