This is a historic moment in global public health, demonstrating the international will to tackle a threat to health head on.

Music is something I must do, business is something I need to do, and Africa is something I have to do. That's the way it breaks down in my life.

I have seen this happen in recent years with regard to pharmaceuticals and vaccines, where, working together, we are improving access to medicines and vaccines for infectious diseases in the poorest countries.

Today osteoporosis affects more than 75 million people in the United States, Europe and Japan and causes more than 2.3 million fractures in the USA and Europe alone.

It's very difficult to evaluate a leader in a very short-term perspective because to be a leader you must be able to have a long-term perspective. You must be able to carry changes which take many years. And this is why you can really only see whether it has been a good leadership after some years have passed.

We are working towards a shared vision of the future for health among all the world's people. A vision future in which we develop new ways of working together at global and national level. A vision which has poor people and poor communities at its centre. And a vision which focuses action on the causes and consequences of the health conditions that create and perpetuate poverty.

To change societies you need to organize with others who share your views.