What is the prothrombin time of von willebrand disease? 
CREATE TABLE table_238124_1 (prothrombin_time VARCHAR, condition VARCHAR)
SELECT COUNT(prothrombin_time) FROM table_238124_1 WHERE condition = "Von Willebrand disease"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_238124_1 (prothrombin_time VARCHAR, condition VARCHAR) Question: What is the prothrombin time of von willebrand disease?  [/INST] SELECT COUNT(prothrombin_time) FROM table_238124_1 WHERE condition = "Von Willebrand disease" </s>