function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Chatterjee, Tapas', 1],
    ['Chatterjee, Tapas & Durucan, Furkan', 4],
    ['Durucan, Furkan', 1],
    ['Erman, Orhan & Gülle, Pinar & Özkan, Muhlis & Candoğan, Hülya', 1],
    ['Erman, Orhan & Pešić, Vladimir & Esen, Yunus & Özkan, Muhlis', 1],
    ['Harvey, Mark S.', 1],
    ['LIU, DONG & YI, TIAN-CI & XU, YUN & ZHANG, ZHI-QIANG', 1],
    ['Pešić, Vladimir', 3],
    ['Pešić, Vladimir & Bańkowska, Aleksandra & Goldschmidt, Tom', 1],
    ['Pešić, Vladimir & Chatterjee, Tapas & Bordoloi, Sabitry', 1],
    ['Pešić, Vladimir & Chatterjee, Tapas & Schizas, Nikolaos V.', 1],
    ['Pešić, Vladimir & Durucan, Furkan & Zawal, Andrzej', 2],
    ['Philippi, R. A.', 1],
    ['Smit, H. & Gerecke, R.', 1],
    ['Smit, Harry', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=22)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 15, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);