The phrase "difficulty in availability" is correct and usable in written English.
You can use it when you wish to describe something that is difficult to find or acquire. For example, "There is a difficulty in availability of quality materials for the project."
While weekly prices of LNG are from Jan 2000 to June 2015 due to the difficulty in the availability of the data and there are 804 observations.
We did not compare the running time strictly between the three methods due to difficulty in their availability.
The reason therefore were difficulties in the availability of the Sabin strain LSc-2ab in some European countries.
Limiting factors for the use of rhTSH are its high costs and occasional difficulties in product availability.
Integrating wind generation into power systems and wholesale electricity markets presents unique challenges due to the characteristics of wind power, including its limited dispatchability, variability in generation, difficulty in forecasting resource availability, and the geographic location of wind resources.
There is the added difficulty in that the availability of microbiologists with experience of handling category 4 pathogens, such as Lassa fever, Ebola and Rift Valley fever viruses, is now universally restricted to specialists close to, or beyond, retirement.
The study found a shift in practice in line with evidence over an eight year period (1988 -1996), with little evidence of any planned dissemination or implementation activities at the maternity units; the authors comment on the difficulty in attributing the change to availability of evidence through the Cochrane Collaboration and national dissemination activities [ 3].
But problems lie in the lack of cooperation with psychiatrists and psychologists and in difficulties of availability of psychotherapists, as FDs also mentioned.
The difficulties in improving the availability, reliability, and accuracy of these indoor capable GNSS receivers exceed those of the receivers designed for the most hostile urban canyon environments.
Major difficulty in development of dengue diagnostics is availability of suitable antigens.
