John P. Pratt

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INTRODUCTION Even though advantages of ultrasound line placement seem obvious, many countries do not have easy access to such technology. This study aims to compare the degree of difficulty in central venous line placement with or without ultrasound and the incidence of complications, and to establish the effect of the operator's degree of training. (More)
To study the time of ovulation in the menstrual cycle, an investigation was planned to recover ova from the uterine tubes, to correlate their condition with the menstrual history and stage of development of the early corpora lutea from which these ova had been extruded, and to quantitatively analyze the ovarian hormone level in tissues of the human ovary.(More)