Before revision:  The model also accounted for the interaction dynamics of players, considering three different sources of infection: (i) the player social circle, (ii) the interaction with his/her team colleagues during training sessions and (iii) the interaction with rivals during a match.
After revision:  The model also accounted for the interaction dynamics of players, considering three different sources of infection: (i) the player social circle, the contact with his/her team colleagues during training sessions and (iii) the interaction with rivals during a match.