Database: mental_health_survey
Question: How many users, between the age 27 to 35, were surveyed in 2018?
SQL: SELECT T1.UserID FROM Answer AS T1 INNER JOIN Question AS T2 ON T1.QuestionID = T2.questionid WHERE T1.SurveyID = 2018 AND T2.questionid = 1 AND T1.AnswerText BETWEEN '27' AND '35'