Reference values for time intervals between atrial and ventricular contractions of the fetal heart measured by two Doppler techniques☆
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Dr. Sonesson was supported by the Karolinska Institute, the Swedish Society of Medicine and Stiftelsen Frimurare Barnhuset, Stockholm, Sweden. Dr. Andelfinger received a fellowship grant from the Department of Pediatrics, St. Justine Hospital, Montreal, Quebec, Canada.
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