SAN FRANCISCO — After a long opening day of company presentations and meetings at the 33rd annual J.P. Morgan Healthcare Conference, snagging people's attention for a 5 p.m. panel discussion is an impressive feat. That's the time of day when most attendees' minds are on the evening cocktail parties or, as Venrock's Bryan Roberts put it, "beer and chips time." But a panel dubbed "Technology Led Disruption in Healthcare" moderated by Roberts proved that if the topic is hot enough, J.P. Morgan attendees will cram sardines-style into a conference room at the Westin St. Francis to hear what the panelists have to say.