3De Lourdes Gareia - Garcia M, Jimen ez - CoronaA, Jimene- zorona M E, et al. Nosocomial infect ion in a corrmaunit y hospit M in Mexico[J]. Infect Control Hosp Epidemol, 2001, 22(6) : 386 - 388.
4Pikus L, Levine MS, Yang YX, et al. Videofluoroseopic studies of swallowing dysfunction and the relative risk of pneumoma[J ]. AJR Am Roentgenol, 2003, 180:1 613 - 1 616.