function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Al-Khazali, Azhar Mohammed & Kachel, Hamid Saeid', 1],
    ['Candek, Klemen & Gregoric, Matjaz & Kostanjsek, Rok', 2],
    ['Crespo, Luis C & Domenech, Marc & Enguidanos, Alba', 1],
    ['Deltshev, Christo & Komnenov, Marjan & Blagoev, Gergin', 2],
    ['Isaia, Marco & Paschetta, Mauro & Chiarle, Alberto', 1],
    ['Naumova, Maria & Blagoev, Gergin & Deltshev, Christo', 1],
    ['Niekerk, P. van & Dippenaar-Schoeman, A. S.', 14],
    ['Paschetta, Mauro & Christille, Claretta & Marguerettaz, Fabio', 1],
    ['Polchaninova, N. & Gnelitsa, V. & Terekhova, V. & Iosypchuk, A.', 1],
    ['Ponomarev, A. V. & Bragina, T. M. & Shmatko, V. Yu.', 1],
    ['Tang, Guo & Li, Shuqiang', 2],
    ['ZONSTEIN, SERGEI & MARUSIK, YURI M.', 1],
    ['van Niekerk, P. & Dippenaar-Schoeman, A. S.', 10]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=38)',
    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);