function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Appolloni, Massimo & Smriglio, Carlo & Amati, Bruno', 2],
    ['Massier, Werner & Zettler, Michael Lothar', 1],
    ['McGhie, Henry', 2],
    ['Ortega, José Rafael & Gofas, Serge', 3],
    ['Pease, W. H.', 2],
    ['Perna, Rafael La & Vazzana, Angelo', 2],
    ['Rolán, E. & Gori, S.', 3],
    ['Rothpletz, (Friedrich) August & Simonelli, V.', 1],
    ['Sosso, Maurizio & Brunetti, M. Mauro & Dell’angelo, Bruno', 1],
    ['Veldsman, Stephane G.', 9],
    ['Veldsman, Stephane G. & Veldsman, Vellies', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=28)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 11, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);