%0 Letter %T 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". %A Martins IMC %A Miola AC %A Garbers LEFM %A Miot HA %J An Bras Dermatol %V 99 %N 5 %D 2024 Sep-Oct 13 %M 38876968 %F 2.113 %R 10.1016/j.abd.2024.03.002