Authors' contributions
KM, AR, TJS, AH, RK, ML: Conception and design. Manandhar, Risal, Steiner, Linde: Acquisition of data. KM, AR, ML, TJS: Analysis and interpretation of data. Manandhar: Drafting the article. KM, AR, TJS, AH, RK, ML: Revising it critically for important intellectual content. AR, TJS, AH, RK, ML: Giving final approval of the version to be submitted. All authors read and approved the final manuscript.