83 In older people low vitamin D levels may produce functional problems including proximal muscle weakness, difficultly rising from a chair, difficulties in ascending stairs, and axial balance problems.
Regarding the large amount of expiration time, security weakens and with the small amount of expiration times, certificates must be frequently renewed, so this may produce performance problems, because large amount of data must be transferred between DCAs and client nodes.
The ultimate available uranium is believed to be sufficient for at least the next 85 years, although some studies indicate underinvestment in the late twentieth century may produce supply problems in the 21st century.
However, this complex approach may produce some problems in terms of practicability and reliability, as well as in the interpretation of results (eg, distinction between the different qualities of the underlying metabolic pathways).
First, the small sample size and restriction of patients to those with severe asthma may have produced problems with external validity in the selection of subjects.
Their analysis is now being studied and debated, but, many medical experts said, at the very least it points out that even mammography may produce the same problems as other screening tests.
The transfer of potentials between the grounding area to outside points by buried conductors, such as communication or signal circuits, neutral wires, pipes, rails, or metallic fences, may produce serious safety problems [Comput Methods Appl Mech Eng, 174 (1999) p. 73].
These are likely to be overlooked in clinical practice but may produce significant health problems when cocaine use is discontinued during recovery.
The Chebyshev tau spectral method for approximating eigenvalues of boundary value problems may produce spurious eigenvalues with large positive real parts, even when all true eigenvalues of the problem are known to have negative real parts.
A priori identification of biologically realistic model structure, combined with computational protections against these statistical problems, may produce more robust models of invasion risk.
