"I think it's progressing. It has been prolonged. It has been frustrating, but certainly putting in the time and effort into the rehab and a very gradual loading sort of a batting schedule as well because clearly in the last sort of a year and a bit, I have tried to learn as much as I can about it. And, it has been a very frustrating time, really, one of the more frustrating periods in my career where it's essentially not something that's broken. Still, something more disruptive than anything to my body," Williamson concluded.