This was especially true when running Facebook contests, because it's difficult to interact with Facebook tabs from Facebook's mobile app.
In general LTFU participants reported that it is difficult to interact with the teachers at school, as described by this 16 y.o.o
They expressed to the test leader that it was difficult to interact with a doll, but most of the staff did not consider this a major problem; the idea was to follow staff members' everyday work process.
The HCPs participating in this study reported that they had observed that for some women it was difficult to interact with their baby, to touch or care for them initially due to their insecurity, to the limitations and rules imposed by the hospital and to the fear of hurting the baby.
A statistically more accurate model could be derived by assuming each replicate to follow an independent GP, but this would require different kind of constraints to differentiate between selection and drift, which may be difficult to formulate for multiple interacting SNPs.
Any given symptom may have several possible causes, and further, these causes may interact with one another and therefore be difficult to isolate.
It should understand that short-term, vertical programmes, on their own, are difficult to reconcile with an HRAP or CCD approach as the costs of a long-term engagement with community institutions (and with the State and private structures that interact with them) can be difficult to justify within the frame of a vertical programme.
As a general rule, independent travelers are more likely to interact with those also traveling by themselves: a big group can be difficult to be approach.
Indeed, because they interact and spread from one to another, the affects will be difficult to enumerate.
31 Some individuals may experience multiple interacting or overlapping difficulties which may be difficult to resolve in isolation.
