11 percent http://emedicine.medscape.com/article/1049978-overview http://emedicine.medscape.com/article/1049978-overview Cholinergic Urticaria http://emedicine.medscape.com/article/1049978-overview Cholinergic urticaria CHOLINERGIC URTICARIA http://emedicine.medscape.com/article/1049978-overview CHOLINERGIC URTICARIA