Copyright © Lippincott Williams & Wilkins. Unauthorized reproduction of this article is prohibited.
We would like to thank Dr Helena Marzo-Ortega for providing Fig. 2.
References and recommended reading
Papers of particular interest, published within the annual period of review, have
been highlighted as:
of special interest
of outstanding interest
Additional references related to this topic can also be found in the Current
World Literature section in this issue (pp. 428–429).
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