TY - JOUR AU - Taskinen, H; Kyyrönen, P; Hemminki, K TI - Effects of ultrasound, shortwaves, and physical exertion on pregnancy outcome in physiotherapists JO - Journal of Epidemiology and Community Health VL - 44 PY - 1990 DO - 10.1136/jech.44.3.196 SP - 196 EP - 201 ER -