Database: aan_1
Question: How many collaborators has Mckeown , Kathleen had ?
SQL:
select count (distinct t2.author_id) from author_list as t1 join author_list as t2 on t1.paper_id  =  t2.paper_id and t1.author_id != t2.author_id join author as t3 on t1.author_id  =  t3.author_id where t3.name = "mckeown ,  kathleen"