function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['DeMarmels, Jurg', 1],
    ['Gonzalez Soriano, Enrique & Noguera, Felipe', 1],
    ['Kormondy, E. J.', 1],
    ['Mauffray, William F. & Tennessen, Kenneth J.', 1],
    ['Márquez, Javier A. & Principe, Romina E. & Berejnoi, Diego E.', 2],
    ['Rodríguez, Fredy Palacino & Sarmiento, Carlos E.', 13],
    ['Rogers, D. Christopher & Cruz-Rivera, Edwin', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=20)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 7, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);