Write an article that answers the following question: How many touchdown runs between 1 and 20 yards were made?
The Texans began their 2008 campaign on the road against the Pittsburgh Steelers.  In the first quarter, Houston trailed early as Steelers RB Willie Parker got a 7-yard TD run.  In the second quarter, the Texans continued to trail as Parker got a 13-yard TD run, while QB Ben Roethlisberger completed a 13-yard TD pass to WR Hines Ward.  Houston would end the half with kicker Kris Brown getting a 34-yard field goal.  In the third quarter, the Texans continued to trail as Parker got a 4-yard TD run, while Roethlisberger and Ward hooked up with each other again on a 16-yard TD pass.  In the fourth quarter, Houston replied with QB Matt Schaub completing a 14-yard TD pass to WR Kevin Walter.  Pittsburgh would respond with kicker Jeff Reed nailing a 44-yard field goal.  The Texans would close out the game with Schaub getting a 4-yard TD run.