0	0.14553	health life data age years survey model effects 
1	0.21499	fertility population age countries birth cohort period women 
2	0.18344	fertility family children women gender attitudes intentions child 
3	0.20251	family marriage educational relationship education children couples social 
4	0.17382	migration social migrants refugees economic demographic labour countries 
5	0.14913	migration population urban cities areas regional internal spatial 
6	0.24902	germany german und age employment work für women 
7	0.05912	der die und für den von auf des