What do A pos and C pos mean?
The # column is the rank of each listed entry for International Psychogeriatrics — rank 1 means this entry is where International Psychogeriatrics has the most articles or citations. A pos and C pos show the reciprocal: the position of International Psychogeriatrics within that entry's own ranked list, by articles and citations respectively. A low value means International Psychogeriatrics is among the most prominent contributors for that entry.