Author contributions: In this section, each author’s contribution must be exactly declared using initials to indicate each author’s identity. Each author must contribute at least two parts (for example, “J.C. and T.P. designed the study; J.C., D.N, and R.K. conducted the experimental work; B.A. analyzed the data; H.L. and B.A. wrote the manuscript, etc.”). Based on the recommendations by the International Committee of Medical Journal Editors/ICMJE (http://www.icmje.org) about the conduct, reporting, editing and publication of scholarly work in medical journals, all authors should have made significant conceptual, intellectual, experimental, and analytical contributions to the research, as well as having participated in writing and revising the manuscript.