How many times was Elly Koss given a care plan between 1/11/2009 and 10/23/2010?
between 1/11/2009 and 10/23/2010 refers to careplans.START between '2009-11-1' and '2010-10-23';
SELECT COUNT(T2.PATIENT) FROM patients AS T1 INNER JOIN careplans AS T2 ON T1.patient = T2.PATIENT WHERE T1.first = 'Elly' AND T1.last = 'Koss' AND T2.START BETWEEN '2009-01-11' AND '2010-10-23'