El Diario de Pontevedra : periódico liberal: Ano L Número 15777 - 1936 maio 13

Additional file 4: Figure S4. Comparison of standardized differences (A, B) and propensity scores (C, D) in unmatched and matched samples. A, C: propensity score matching in overall dataset; B, D: propensity score matching of dataset excluding deaths with other reasons