function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Aguilar-Camacho, Jose Maria & Carballo, Jose Luis', 2],
    ['Calcinai, Barbara & Bavestrello, Giorgio & Bertolino, Marco', 2],
    ['Calcinai, Barbara & Belfiore, Giuseppe & Pica, Daniela', 1],
    ['Goodwin, Claire & Brickle, Paul', 2],
    ['Goodwin, Claire E. & Berman, Jade & Hendry, Katharine R.', 2],
    ['Gray, John Edward', 1],
    ['Göcke, Christian & Janussen, Dorte', 4],
    ['Jaramillo, Karla B. & Condor-Lujan, Baslavi & Longakit, Belinda', 1],
    ['Lehnert, Helmut & Stone, Robert & Heimler, Wolfgang', 1],
    ['Pestana, Rosa & Ribeiro, Cláudia & Boury-Esnault, Nicole', 1],
    ['Sim-Smith, Carina & Hickman, Cleveland & Kelly, Michelle', 2],
    ['Van, Rob W. M.', 2],
    ['Van, Rob W. M. & Kaiser, Kirstie L. & Syoc, Robert Van', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=22)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 13, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);