Importance of pelvic muscle tenderness evaluation in women with chronic pelvic pain - Montenegro, Mary Lourdes Lima De Souza; Mateus-Vasconcelos, Elaine Cristine Lemes; Silva, Júlio César Rosa E.; Nogueira, Antonio Alberto; Reis, Francisco José Cândido dos; Poli Netto, Omero Benedicto (Pain Medicine, 2010)