List all outpatient within normal range of creatinine phosphokinase. Give me the distinct ids.
outpatient refers to Admission = '-'; normal range of creatinine phosphokinase refers to CPK < 250;
SELECT DISTINCT T1.ID FROM Patient AS T1 INNER JOIN Laboratory AS T2 ON T1.ID = T2.ID WHERE T2.CPK < 250 AND T1.Admission = '-'