Table schema:
CREATE TABLE table_1555308_1 (bleeding_time VARCHAR, prothrombin_time VARCHAR, platelet_count VARCHAR)

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