What is the prothrombin time of von willebrand disease?
CREATE TABLE table_2950 (
    "Condition" text,
    "Prothrombin time" text,
    "Partial thromboplastin time" text,
    "Bleeding time" text,
    "Platelet count" text
)
SELECT COUNT("Prothrombin time") FROM table_2950 WHERE "Condition" = 'Von Willebrand disease'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What is the prothrombin time of von willebrand disease? ### Input: CREATE TABLE table_2950 (
    "Condition" text,
    "Prothrombin time" text,
    "Partial thromboplastin time" text,
    "Bleeding time" text,
    "Platelet count" text
) ### Response: SELECT COUNT("Prothrombin time") FROM table_2950 WHERE "Condition" = 'Von Willebrand disease'