Funding for this research was provided by:
Finnish Medical Foundation
Juho Vainio Foundation
Maire Taponen Foundation
Petri Honkanen Foundation
Article History
Received: 15 May 2019
Revised: 2 September 2019
Accepted: 22 September 2019
First Online: 29 October 2019
Compliance with ethical standards
: Study protocol is available in the international prospective register of systematic reviews (PROSPERO, code CRD42018100003) and follows the checklist of Preferred Reporting Items for Systematic review and Meta-Analyses (PRISMA).
: Reported foundations have no personal or institutional financial interests concerning this study.
: The authors declare that they have no conflict of interest.
: This article does not contain any studies with human participants or animals performed by any of the authors.
: The review was based on systematic literature search and thus, included no personal data.