Bochen F, Balensiefer B, Korner S, Bittenbring JT, Neumann F, Koch A, et al. Vitamin D deficiency in head and neck cancer patients - prevalence, prognostic value and impact on immune function. Oncoimmunology. 2018; 7: e1476817, CrossRef.

Mäkitie A, Tuokkola I, Laurell G, Mäkitie O, Olsen K, Takes RP, et al. Vitamin D in head and neck cancer: a systematic review. Curr Oncol Rep. 2020; 23: 5, CrossRef.

Huo M, Panizza B, Bernard A, Porceddu SV. Head and neck squamous cell carcinoma of unknown primary: Outcomes of a pre-defined institutional treatment policy in a region with a high prevalence of skin cancer. Oral Oncol. 2018; 77: 43-8, CrossRef.

Fanidi A, Muller DC, Midttun O, Ueland PM, Vollset SE, Relton C, et al. Circulating vitamin D in relation to cancer incidence and survival of the head and neck and oesophagus in the EPIC cohort. Sci Rep. 2016; 6: 36017, CrossRef.

Kelvianto A, Witjaksono F, Sekarutami SM. Protein intake, prognostic nutritional index and quality of life in head and neck cancer patients undergoing radiotherapy. Indones Biomed J. 2019; 11: 70-7, CrossRef.

American Cancer Society. Cancer Treatment & Survivorship Facts & Figures 2019-2021. Atlanta: American Cancer Society; 2019, article.

The Global Cancer Observatory [Internet]. Indonesia Globocan 2020 [cited 2021 Aug 20]. Available from: https://gco.iarc.fr/.

Pu Y, Zhu G, Xu Y, Zheng S, Tang B, Huang H, et al. Association between vitamin d exposure and head and neck cancer: a systematic review with meta-analysis. Front Immunol. 2021; 12: 627226, CrossRef.

Izreig S, Hajek M, Edwards HA, Mehra S, Sasaki C, Judson BL, Rahmati RW. The role of vitamin D in head and neck cancer. Laryngoscope Investig Otolaryngol. 2020; 5: 1079-88, CrossRef.

Yokosawa EB, Arthur AE, Rentschler KM, Wolf GT, Rozek LS, Mondul AM. Vitamin D intake and survival and recurrence in head and neck cancer patients. Laryngoscope. 2018; 128: E371-6, CrossRef.

Izzo M, Carrizzo A, Izzo C, Cappello E, Cecere D, Ciccarelli M, et al. Vitamin D: not just bone metabolism but a key player in cardiovascular diseases. Life (Basel). 2021; 11(5): 452, CrossRef.

Park CY, Han SN. The role of Vitamin D in adipose tissue biology: adipocyte differentiation, energy metabolism, and inflammation. J Lipid Atheroscler. 2021; 10: 130-44, CrossRef.

Zielinska A, Sobolewska-Wlodarczyk A, Wisniewska-Jarosinska M, Gasiorowska A, Fichna J, Salaga M. The 25(OH)D3, but not 1,25(OH)2D3 levels are elevated in IBD patients regardless of vitamin D supplementation and do not associate with pain severity or frequency. Pharmaceuticals (Basel). 2021; 14(3): 284, CrossRef.

Sari DK, Sari LM, Laksmi LI, Farhat. The moderate correlation between 25(OH)D serum and saliva in healthy people with low vitamin D intake. Int J Gen Med. 2021; 14: 841-50, CrossRef.

Bahramian A, Falsafi P, Abbasi T, Ghanizadeh M, Abedini M, Kavoosi F, et al. Comparing serum and salivary levels of vitamin d in patients with recurrent aphthous stomatitis and healthy individuals. J Dent Shiraz Univ Med Sci. 2018; 19: 295-300, PMID.

Kartikawati A, Lina Y, Wijaya A. 25(OH)D was Correlated with increased risk of insulin resistance, but not mediated by adiponectin and hsCRP. Indones Biomed J. 2012; 4: 84-92, CrossRef.

Weir CB, Jan A. BMI Classification Percentile And Cut Off Points. Treasure Island (FL): StatPearls Publishing; 2021, article.

Chiappin S, Antonelli G, Gatti R, De Palo EF. Saliva specimen: a new laboratory tool for diagnostic and basic investigation. Clin Chim Acta. 2007; 383; 30-40, CrossRef.

Heaney RP, Holick MF. Why the IOM recommendations for vitamin D are deficient. J Bone Miner Res. 2011; 26: 455-7, CrossRef.

Grant WB, Holick MF. Benefits and requirements of vitamin D for optimal health: a review. Altern Med Rev. 2005; 10: 94-111, PMID.

Augustin J, Outh-Gauer S, Mandavit M, Lépine C, Broudin C, Hans S, et al. [Study of the Human Papillomavirus (HPV) prevalence in head and neck carcinomas in a French monocentric cohort of 372 patients]. Ann Pathol. 2020; 40: 401-10, CrossRef.

Grant WB, Moukayed M. Vitamin D3 from ultraviolet-b exposure or oral intake in relation to cancer incidence and mortality. Curr Nutr Rep. Sep; 8: 203-11, CrossRef.