Among the patients with a normal blood glucose, how many of them don't have thrombosis?
normal blood glucose refers to GLU < 180; don't have thrombosis refers to Thrombosis = 0;
SELECT COUNT(T1.ID) FROM Patient AS T1 INNER JOIN Laboratory AS T2 ON T1.ID = T2.ID INNER JOIN Examination AS T3 ON T1.ID = T3.ID WHERE T2.GLU < 180 AND T3.Thrombosis = 0