Database: thrombosis_prediction
Question: List each patient's ID and blood glucose (GLU) index that were within normal range for patient's whose data was first recorded in 1991.
SQL: SELECT DISTINCT T1.ID, T2.GLU FROM Patient AS T1 INNER JOIN Laboratory AS T2 ON T1.ID = T2.ID WHERE STRFTIME('%Y', T1.`First Date`) = '1991' AND T2.GLU < 180