sentence1: The states that participated in this study were Aguascalientes , Chiapas , Chihuahua , Durango , Guerrero , Jalisco , Oaxaca , Sinaloa , Veracruz and Yucatan .
sentence2: The states that have participated in this study were Aguascalientes , Jalisco , Chihuahua , Durango , Guerrero , Chiapas , Oaxaca , Sinaloa , Veracruz and Yucatan .