question: What is the total number of patient portayers for the episode directed by Craig Zisk and written by Brad Falchuk?
answer: SELECT COUNT(patient_portrayer) FROM table_26561508_1 WHERE directed_by = "Craig Zisk" AND written_by = "Brad Falchuk"
context: CREATE TABLE table_26561508_1 (patient_portrayer VARCHAR, directed_by VARCHAR, written_by VARCHAR)