Giant cell arteritis: new concepts, treatments and the unmet need that remains by Coath, F, Gillbert, K, Griffiths, B, Hall, F, Kay, L, Lanyon, P, Luqmani, R, Mackie, S, Mason, J, Mills, J, Mollan, S, Morgan, A, Mukhtyar, C, Quick, V, Watts, R, Dasgupta, B