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