Age at symptom onset in ankylosing spondylitis: is there a gender difference?. Issue 10 (7th August 2014) - Ciurea, Adrian; Scherer, Almut; Weber, Ulrich; Neuenschwander, Regula; Tamborrini, Giorgio; Exer, Pascale; Bernhard, Jürg; Villiger, Peter M; Kissling, Rudolf; Michel, Beat A; Stekhoven, Daniel