1.
(Page 121) Observation of manganese deposits during the Dutch Siboga Expedition
2.
Socioeconomic analyses.
3.
Ranking of the number of articles per Gross Expenditure on Research and Development (GERD) of publishing countries with at least 30 articles (threshold).
Epidemiologic analysis of cervical cancer research.
Comparison of country specific research activities between ovarian cancer research (1900–2014) and cervical cancer research (1900–2015).