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Diakses 20 Januari 2020Healthline. https://www.healthline.com/nutrition/how-to-gain-weight#section3
Diakses 20 Januari 2020Medical News Today. https://www.medicalnewstoday.com/articles/321612.php#when-to-see-a-doctor
Diakses 20 Januari 2020Mayo Clinic. https://www.mayoclinic.org/healthy-lifestyle/nutrition-and-healthy-eating/expert-answers/underweight/faq-20058429
Diakses 20 Januari 2020