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In fact, certification of residency programs requires documentation of adequate exposure to and training in the evaluation of first-trimester ultrasound.

Failure to understand the limitations of diagnostic ultrasound or inadequate training of physicians in this technique can result in grave complications for the patient and liability for health-care providers.

Long-term reconstructions of glacier mass balance could increase the precision of glacier models by providing the required calibration data.

Here we show the possibility of applying shrub growth increments as an on-site proxy for glacier summer mass balance, exemplified by Salix shrubs in Finse, Norway.

To calibrate and validate glacier models, past records of glacier mass balance are necessary, which often only span several decades.The familiar terms calendar and era (within the meaning of a coherent system of numbered calendar years) concern two complementary fundamental concepts of chronology.For example, during eight centuries the calendar belonging to the Christian era, which era was taken in use in the 8th century by Bede, was the Julian calendar, but after the year 1582 it was the Gregorian calendar. uses cookies to improve performance by remembering your session ID when you navigate from page to page. Please set your browser to accept cookies to continue.

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