Yusniar Siregar Poltekkes Kemenkes Medan Indonesia
Rismahara Lubis Poltekkes Kemenkes Medan Indonesia
Evi Irianti https://www.scopus.com/authid/detail.uri?authorId=57201724261 Poltekkes Kemenkes Medan; e-mail: evidesman@gmail.com (koresponden) Indonesia