CREATE TABLE table_1555308_1 (bleeding_time VARCHAR2, prothrombin_time VARCHAR2, platelet_count VARCHAR2)

What are all the possible bleeding time results where prothrombin time and platelet count are both unaffected?
SELECT bleeding_time FROM table_1555308_1 WHERE prothrombin_time = "Unaffected" AND platelet_count = "Unaffected"
SELECT "bleeding_time" FROM "table_1555308_1" WHERE "Unaffected" = "platelet_count" AND "Unaffected" = "prothrombin_time"