Arsenal's Vermaelen: Scoring form down to Van Persie
"It is not a secret, it is just being smart in the box really," Vermaelen told ESPN. "Think where the ball can be when somebody crosses.
"You just have to make good runs and sometimes the ball comes in there and you can score goals. It is the delivery as well. Robin has a great free-kick and for us that is very important, I think everything helps for us in that situation.''