function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Bolívar, Ignatio', 2],
    ['Chand, D. Suresh & Das, Swapan Kumar & Kumar, Hirdesh', 2],
    ['Felix, Rob P. W. H. & Massa, Bruno', 1],
    ['Hollier, John', 3],
    ['Kim, Tae-Woo & Puskás, Gellért', 1],
    ['Roy, Roger', 4],
    ['Saussure, Henri de', 1],
    ['Usmani, Mohd. Kamil & Nayeem, Md. Rashid', 1],
    ['Xian, Chunlan & Leong, Chi Man & Luo, Jiuyang & Jia, Fenglong', 1],
    ['Yin, Xiang-Chu & Shi, Jian-Ping', 5]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=21)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 10, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);