A comparative study of the clinical efficacy of immunotherapy and conventional pharmacological treatment for patients with perennial allergic rhinitis. - Ohashi,Y.; Nakai,Y.; Tanaka,A.; Kakinoki,Y.; Washio,Y.; Yamada,K.; Sakamoto,H.; Nasako,Y.; Hayashi,M. (Acta Otolaryngol Suppl, 1998)