Aspects related to the inference of causality in cross-sectional studies. Comments on: “8-Hydroxy-2’-deoxyguanosine protein immunoexpression is associated with the pathogenesis of actinic cheilitis” - Martins, Ivanka Miranda de Castro [UNESP]; Miola, Anna Carolina [UNESP]; Garbers, Luiz Eduardo Fabrício de Melo [UNESP]; Miot, Hélio Amante [UNESP] (Elsevier, 2024)