The authors regret that Fig. 1 as published in the original article is incorrect. We have here provided the correct figure.
The authors would like to apologize for any inconvenience caused.
Fig. 1.

The Gateway Provider Model.Stiffman et al., 2004
The authors regret that Fig. 1 as published in the original article is incorrect. We have here provided the correct figure.
The authors would like to apologize for any inconvenience caused.

The Gateway Provider Model.Stiffman et al., 2004