Among the patients with the normal level of triglyceride, how many of them have other symptoms observed?
normal level of triglyceride refers to TG < 200; have other symptoms refers to Symptoms is not null;
SELECT COUNT(T1.ID) FROM Examination AS T1 INNER JOIN Laboratory AS T2 ON T1.ID = T2.ID WHERE T2.TG < 200 AND T1.Symptoms IS NOT NULL