1MEDICAL JOURNAL infection, but only in situations of special risk, such as the thoracic unit described and where a sufficiently high cross-infection rate has been reported. We wish to thank Dr. E. T. Knudsen, of Beecham Research Laboratories, for the generous supply of methicillin. Our thanks are also due to Dr. I. A. Tounjer and Sisters B. M. Shelton and P. J. Gower for their very efficient ward work. We also thank Mr. G. L. C. Usher, the chief technician, Mr. V. van Geersdaele, the senior laboratory technician, and their staff for dealing with the increased bacteriological work.

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The occurrence of skeletal morbidity in ALL children may be influenced by age and the type of glucocorticoids. These findings may facilitate the development of effective bone protective intervention.

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