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Amalia, Amalia, Universitas Sumatera Utara
Ambarita, Himsar, <p><em>University of Sumatera Utara, Jl. Almamater Kampus USU Medan 20155, Indonesia</em></p>
Ambarita, Himsar, Universitas Sumatera Utara
Ambarita, Himsar, University of Sumatera Utara
Apriani, Ridha, Universitas Sumatera Utara
Arif, Salmawaty, Syiah Kuala University