Table 3.

Classification of articles by level and type of integration (n=53)

Level of integration (according to Delnoj et al., 2001)	Number of studies/ literature reviews	Type of integration (vertical vs. horizontal)	Conclusions
Functional	8	Vertical (1) Horizontal (7)	Primary emphasis of interventions at a micro level, followed by interventions at a meso level. A total of 36 studies/reviews on vertical (targeted) integration and 17 on horizontal (comprehensive) integration.
Organizational	16	Vertical (11) Horizontal (5)
Professional	9	Vertical (6) Horizontal (3)
Clinical	20	Vertical (18) Horizontal (2)