The phrase "additionally difficult" is correct and usable in written English.
It can be used to describe something that is made more challenging in addition to other difficulties already mentioned.
Example: "The project is already complex, and the new requirements make it additionally difficult to complete on time."
Alternatives: "further challenging" or "more difficult as well".
So, in the future, actual real-time demand may be additionally difficult to predict day-ahead.
Additionally, difficult relationships with colleagues and/or the school principal (school-related challenges) significantly reduced job satisfaction and work engagement.
Moreover, detecting superimposed pneumonia in patients presenting with AHF is additionally difficult because of the similar and therefore non-specific physical exam and chest X-ray abnormalities.
Detecting superimposed pneumonia in patients presenting with acute heart failure (AHF) is additionally difficult because of the non-specific nature of chest X-ray abnormalities in the setting of cardiogenic pulmonary oedema.
Communication relative to the levels protective of health was made additionally difficult by the fact that countries in some cases published different "action" levels; some countries even used any melamine concentration detected as a signal for action.
It is additionally difficult to evaluate each case according to histology since the initial biopsy was taken from the apparently more representative zone of the lesion but the final biopsy comprises the whole lesion, so this last evaluation was more exhaustive.
Additionally, difficult-to-treat pathogens and SOP adherence < 65% were also significantly associated with mortality.
Additionally, the difficult economic situation and the high unemployment rates in Palestine might force the sick workers to complain less in order to keep their jobs.
Poles, recycling bins, and children were additionally mentioned as difficult to detect.
Additionally, it is difficult for researchers to do further investigation because of the undeclared source.
Additionally, it is difficult to control for moisture and adhesive application toward the apical region of the canal [118].
