Purba IE, Sihura IR, Tarigan YG. KNOWLEDGE, ATTITUDE, AND BEHAVIOR OF THE ELDERLY TOWARDS THE IMPLEMENTATION OF COVID-19 VACCINATION IN SOUTH NIAS, INDONESIA: A CROSS SECTIONAL STUDY . JMN [Internet]. 2024 Jan. 18 [cited 2024 Nov. 5];7(1):1-11. Available from: http://114.7.97.221/index.php/NERS/article/view/4640