function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Behne, L & Gaedike, H', 1],
    ['Botero, Juan Pablo & Tavakilian, Gérard L. & Seidel, Matthias', 1],
    ['Chapman, Eric G. & Richards, Austin B. & Dupuis, Julian R.', 2],
    ['Chevrolat, A.', 1],
    ['Chittaro, Yannick & Sanchez, Andreas & Blanc, Mickaël', 1],
    ['Danilevsky, M. L.', 3],
    ['Georgiev, Georgi & Sakalian, Vladimir & Mirchev, Plamen', 2],
    ['Gupta, Rajeev & Vitali, Francesco', 5],
    ['Ilić, Nastas & Ćurčić, Srećko', 1],
    ['Karpinski, Lech & Szczepanski, Wojciech T.', 1],
    ['Rapuzzi, Pierpaolo & Jeniš, Ivo', 1],
    ['Stefanelli, Silvia & Della Rocca, Francesca & Bogliani, Giuseppe', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=21)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 12, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);