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