Funding Information: The authors thank the study participants for commitment and loyalty. The authors would like to acknowledge the guidance of the late PD Dr. Bernhard B. Singer, PhD and from Verena Schmitt, PhD from the Universit\u00E4tsklinikum, Essen, Germany for their guidance on setting up the ELISA analysis of circulating CEACAM1 levels. This study was supported by \u201CFunda\u00E7\u00E3o para a Ci\u00E...