How many patients with care plan for 'concussion with loss of consciousness' are married?
concussion with loss of consciousness refers to careplans.DESCRIPTION = 'Concussion with loss of consciousness'; married refers to marital = 'M';
SELECT COUNT(DISTINCT T1.patient) FROM patients AS T1 INNER JOIN careplans AS T2 ON T1.patient = T2.PATIENT WHERE T1.marital = 'M' AND T2.REASONDESCRIPTION = 'Concussion with loss of consciousness'