Table 6. Burden of cost of lip, oral cavity, and oropharynx cancers according to Gross Domestic Product per capita.

Study	Country (currency)	PPP* conversion factor	GDP** per capita (PPP 2019)	Components	Lip	Oral cavity	Oropharynx
1. Kim, 2011 [23]	UK (GBP)			Cost per patient	5,790	25,311	---
		0.68	46,659	% GDP per capita	18.3%	79.8%	---
2. Polesel, 2019 [26]	Italy (EUR)			Cost per patient	---	18,462	24,253
		0.67	42,492	% GDP per capita	---	64.9%	85.2%
3. van Agthoven, 2001 [35]	The Netherlands (EUR)			Cost per patient	---	35,541	35,642
		0.78	56,935	% GDP per capita	---	79.8%	80.3%
4. Lairson, 2017 [41]	EUA (USD)			Cost per patient	---	---	134,454
		1.00	62,530	% GDP per capita	---	---	215.0%

*PPP: Purchasing Power Parity.

**GDP: Gross Domestic Product.